1. An open tank contains 1 m deep water with 50 cm depth of oil of specific gravity 0.8 above it. The intensity of pressure at the bottom of tank will be________________?.
A. 4 kN/m2
B. 10 kN/m2
C. 12 kN/m2
D. 14 kN/m2.
Answer = 14 kN/m2
2. The total pressure on a plane surface inclined at an angle 9 with the horizontal is equal to_______________?.
A. PA
B. pA sin 9
C. pA cos 9
D. pA tan 9.
Answer = PA
3. Centre of buoyancy always_________________?.
A. coincides with the centre of gravity
B. coincides with the centroid of the volume of fluid displaced
C. remains above the centre of gravity
D. remains below the centre of gravity.
Answer = coincides with the centroid of the volume of fluid displaced
4. Metacentric height for small values of angle of heel is the distance between the________________?.
A. centre of gravity and centre of buoy-ancy
B. centre of gravity and metacentre
C. centre of buoyancy and metacentre
D. free surface and centre of buoyancy.
Answer = centre of gravity and metacentre
5. A rectangular block 2 m long, 1 m wide and 1 m deep floats in water, the depth of immersion being 0.5 m. If water weighs 10 kN/m3, then the weight of the block is________________?.
A. 5kN
B. lOkN
C. 15 kN
D. 20 kN.
Answer = lOkN
6. If a vessel containing liquid moves downward with a constant acceleration equal to 'g' then_____________?.
A. the pressure throughout the liquid mass is atmospheric
B. there will be vacuum in the liquid
C. the pressure in the liquid mass is greater than hydrostatic pressure
D. none of the above.
Answer = the pressure throughout the liquid mass is atmospheric
7. An open cubical tank of 2 m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to_______________?.
A. g/3
B. g/2
C. 2g/3
D. g.
Answer = g
8. The horizontal component of force on a curved surface is equal to the_______________?.
A. product of pressure intensity at its centroid and area
B. force on a vertical projection of the curved surface
C. weight of liquid vertically above the curved surface
D. force on the horizontal projection of the curved surface.
Answer = force on a vertical projection of the curved surface
9. The eddy viscosity for turbulent flow is______________?.
A. a function of temperature only
B. a physical property of the fluid.
C. dependent on the flow
D. independent of the flow.
Answer = dependent on the flow
10. In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is_________________?.
A. 22.5 m/sec
B. 33 m/sec
C. 40 m/sec
D. 90 m/sec.
Answer = 40 m/sec
11. If the velocity is zero over half of the cross-sectional area and is uniform over the remaining half, then the momentum correction factor is_______________?.
A. 1
B. 4/3
C. 2
D. 4.
Answer = 2
12. The continuity equation pi V,A,= p2V2A2 is based on the following assumption regarding flow of fluid______________?.
A. steady flow
B. uniform flow
C. incompressible flow
D. frictionless flow.
Answer = steady flow
13. The motion of air mass in a tornado is a________________?.
A. free vortex motion
B. forced vortex motion
C. free vortex at center and forced vortex outside
D. forced vortex at center and free vortex outside.
Answer = forced vortex at center and free vortex outside
14. Stream lines and path lines always coincide in case of__________________?.
A. steady flow
B. laminar flow
C. uniform flow
D. turbulent flow.
Answer = steady flow
15. In steady flow of a fluid, the total accele ration of any fluid particle______________?.
A. can be zero
B. is never zero
C. is always zero
D. is independent of coordinates.
Answer = can be zero
16. Hot wire anemometer is used to measure_______________?.
A. discharge
B. velocity of gas
C. pressure intensity of gas
D. pressure intensity of liquid.
Answer = velocity of gas
17. Which of the following is used to measure the discharge ?.
A. current meter
B. venturimeter
C. pitot tube
D. hotwire anemometer.
Answer = venturimeter
18. Size of a venturimeter is specified by________________?.
A. pipe diameter
B. throat diameter
C. angle of diverging section
D. both pipe diameter as well as throat diameter.
Answer = pipe diameter
19. The discharge through a V- notch varies as______________?.
A. H1/2
B. H3'2
C. H5/2
D. H5'4 where H is head.
Answer = H5/2
20. Coefficient of velocity of venturimeter_________________?.
A. is independent of Reynolds number
B. decreases with higher Reynolds number
C. is equal to the coefficient of discharge of venturimeter
D. none of the above.
Answer = is equal to the coefficient of discharge of venturimeter
21. Coefficient of discharge for a totally submerged orifice as compared to that for an orifice discharging free is__________________?.
A. slightly less
B. slightly more
C. nearly half
D. equal.
Answer = slightly less
22. Coefficient of contraction for an external cylindrical mouthpiece is_________________?.
A. 1.00
B. 0.855
C. 0.7H
D. 0.611.
Answer = 1.00
23. In a Sutro weir, the discharge is proportional to________________?.
A. H1/2
B. H3/2
C. H5/2
D. H.
Answer = H
24. Which of the following statements is correct ?.
A. Lower critical Reynolds number is of no practical significance in pipe flow problems.
B. Upper critical Reynolds number is significant in pipe flow problems.
C. Lower critical Reynolds number has the value 2000 in pipe flow
D. Upper critical Reynolds number is the number at which turbulent flow changes to laminar flow.
Answer = Lower critical Reynolds number is of no practical significance in pipe flow problems
25. The shear stress distribution for a fluid flowing in between the parallel plates, both at rest, is_______________?.
A. constant over the cross section
B. parabolic distribution across the section
C. zero at the mid plane and varies linearly with distance from mid plane
D. zero at plates and increases linearly to midpoint.
Answer = zero at the mid plane and varies linearly with distance from mid plane
26. The boundary layer thickness in turbulent flow varies as______________?.
A. x”7
B. x,/2
C. x4/5
D. x3/5.
Answer = x4/5
27. Ay between two stream lines represents________________?.
A. velocity
B. discharge
C. head
D. pressure.
Answer = discharge
28. Stanton diagram is a______________?.
A. log-log plot of friction factor against Reynolds number
B. log-log plot of relative roughness against Reynolds number
C. semi-log plot of friction factor against Reynolds number
D. semi-log plot of friction factor against relative roughness.
Answer = log-log plot of friction factor against Reynolds number
29. When an ideal fluid flows past a sphere________________?.
A. highest intensity of pressure occurs around the circumference at right angles to flow
B. lowest pressure intensity occurs at front stagnation point
C. lowest pressure intensity occurs at rear stagnation point
D. total drag is zero.
Answer = total drag is zero
30. In which of the following the friction drag is generally larger than pressure drag?.
A. a circular disc or plate held normal to flow
B. a sphere
C. a cylinder
D. an airfoil.
Answer = an airfoil
31. The value of friction factor 'f' for smooth pipes for Reynolds number 106 is approximately equal to________________?.
A. 0.1
B. 0.01
C. 0.001
D. 0.0001.
Answer = 0.01
32. Separation of flow occurs when_________________?.
A. the pressure intensity reaches a minimum
B. the cross-section of a channel is reduced
C. the boundary layer comes to rest
D. all of the above.
Answer = the boundary layer comes to rest
33. The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is_______________?.
A. 1/3 R
B. 1/2 R
C. 2/3 R
D. 3/4R.
Answer = 1/3 R
34. The Prartdtl mixing length is_________________?.
A. zero at the pipe wall
B. maximum at the pipe wall
C. independent of shear stress
D. none of the above.
Answer = zero at the pipe wall
35. A fluid of kinematic viscosity 0.4 cm2/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be__________________?.
A. less than 1 m/sec
B. 1 m/sec
C. 1.5 m/sec
D. 2 m/sec.
Answer = 1 m/sec
36. The wake_______________?.
A. always occurs before a separation point
B. always occurs after a separation point
C. is a region of high pressure intensity
D. none of the above.
Answer = always occurs after a separation point
37. The hydraulic grade line is_________________?.
A. always above the centre line of pipe
B. never above the energy grade line
C. always sloping downward in the direction of flow
D. all of the above.
Answer = never above the energy grade line
38. If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10 stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is________________?.
A. less than 1
B. between 1 and 100
C. 160
D. 200.
Answer = 160
39. In series-pipe problems_______________?.
A. the head loss is same through each pipe
B. the discharge is same through each pipe
C. a trial solution is not necessary
D. the discharge through each pipe is added to obtain total discharge.
Answer = the discharge is same through each pipe
40. A valve is suddenly closed in a water main in wl.ich the velocity is 1 m/sec and velocity of pressure wave is 981 m/ sec. The inertia head at the valve will be________________?.
A. 1 m
B. 10m
C. 100m
D. none of the above.
Answer = 100m
41. The speed of a pressure wave through a pipe depends upon________________?.
A. the length of pipe
B. the viscosity of fluid
C. the bulk modulus for the fluid
D. the original head.
Answer = the bulk modulus for the fluid
42. Two pipe systems are said to be equivalent when_________________?.
A. head loss and discharge are same in two systems
B. length of pipe and discharge are same in two systems
C. friction factor and length are same in two systems
D. length and diameter are same in two systems.
Answer = head loss and discharge are same in two systems
43. The maximum thickness of boundary layer in a pipe of radius r is____________________?.
A. 0
B. r/2
C. r
D. 2r.
Answer = r
44. The losses are more in_________________?.
A. laminar flow
B. transition flow
C. turbulent flow
D. critical flow.
Answer = turbulent flow
45. The velocity distribution for laminar flow through a circular tube__________________?.
A. is constant over the cross-section
B. varies linearly from zero at walls to maximum at centre
C. varies parabolically with maximum at the centre
D. none of the above.
Answer = varies parabolically with maximum at the centre
46. The discharge of a liquid of kinematic viscosity 4 cm2/sec through a 8 cm dia-meter pipe is 3200n cm7sec. The type of flow expected is__________________?.
A. laminar flow
B. transition flow
C. turbulent flow
D. not predictable from the given data.
Answer = laminar flow
47. The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is_______________?.
A. 1/2
B. 2/3
C. 3/2
D. 2.
Answer = 1/2
48. For laminar flow in a pipe of circular cross-section, the Darcy's friction factor f is________________?.
A. directly proportional to Reynolds number and independent of pipe wall roughness
B. directly proportional to pipe wall roughness and independent of Reynolds number
C. inversely proportional to Reynolds number and indpendent of pipe wall roughness
D. inversely proportional to Reynolds number and directly proportional to pipe wall roughness.
Answer = inversely proportional to Reynolds number and indpendent of pipe wall roughness
49. For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is_______________?.
A. constant
B. dependent only on Reynolds number
C. a function of Reynolds number and relative roughness
D. dependent on relative roughness only.
Answer = dependent only on Reynolds number
50. With the same cross-sectional area and immersed in same turbulent flow, the largest total drag will be on__________________?.
A. a circular disc of plate held normal to flow
B. a sphere
C. a cylinder
D. a streamlined body.
Answer = a circular disc of plate held normal to flow
51. The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is________________?.
A. 0.223 R
B. 0.423 R
C. 0.577 R
D. 0.707 R.
Answer = 0.223 R
52. In case of an airfoil, the separation of flow occurs________________?.
A. at the extreme rear of body
B. at the extreme front of body
C. midway between rear and front of body
D. any where between rear and front of body depending upon Reynolds number.
Answer = at the extreme rear of body
53. The depth 'd' below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be_________________?.
A. 0.423 D
B. 0.577 D
C. 0.223 D
D. 0.707 D.
Answer = 0.577 D
54. If x is the distance from leading edge, then the boundary layer thickness in laminar flow varies as________________?.
A. x
B. x
C. x
D. x/7.
Answer = x
55. For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be_________________?.
A. 300
B. 337.5
C. 600
D. 675.
Answer = 675
56. The discharge over a broad crested weir is maximum when the depth of flow is_______________?.
A. H/3
B. H/2
C. 2 H/5
D. 2 H/3.
Answer = 2 H/3
57. Which of the following has highest coefficient of discharge ?.
A. sharp edged orifice
B. venturimeter
C. Borda's mouthpiece running full
D. CipoUetti weir.
Answer = venturimeter
58. The major loss of energy in long pipes is due to_______________?.
A. sudden enlargement
B. sudden contraction
C. gradual contraction or enlargement
D. friction.
Answer = friction
59. Coefficient of velocity for Borda's mouth piece running full is________________?.
A. 0.611
B. 0.707
C. 0.855
D. 1.00.
Answer = 0.707
60. The pressure at the summit of a syphon is_______________?.
A. equal to atmospheric
B. less than atmospheric
C. more than atmospheric
D. none of the above.
Answer = less than atmospheric
61. Due to each end contraction, the discharge of rectangular sharp crested weir is reduced by________________?.
A. 5%
B. 10%
C. 15%
D. 20%.
Answer = 5%
62. The theoretical value of coefficient of contraction of a sharp edged orifice is_______________?.
A. 0.611
B. 0.85
C. 0.98
D. 1.00.
Answer = 0.611
63. The pitot tube is used to measure________________?.
A. velocity at stagnation point
B. stagnation pressure
C. static pressure
D. dynamic pressure.
Answer = stagnation pressure
64. Equation of continuity is based on the principle of conservation of_________________?.
A. mass
B. energy
C. momentum
D. none of the above.
Answer = mass
65. In a forced vortex motion, the velocity of flow is________________?.
A. directly proportional to its radial distance from axis of rotation
B. inversely proportional to its radial distance from the axis of rotation
C. inversely proportional to the square of its radial distance from the axis of rotation
D. directly proportional to the square of its radial distance from the axis of rotation.
Answer = directly proportional to its radial distance from axis of rotation
66. Which of the following velocity potentials satisfies continuity equation ?.
A. x2y
B. x2-y2
C. cosx
D. x2 + y2.
Answer = x2-y2
67. If velocity is zero over l/3rd of a cross-section and is uniform over remaining 2/3rd of the cross-section, then the correction factor for kinetic energy is__________________?.
A. 4/3
B. 3/2
C. 9/4
D. 27/8.
Answer = 9/4
68. When the velocity distribution is uniform over the cross-section, the correction factor for momentum is__________________?.
A. 0
B. 1
C. 4/3
D. 2.
Answer = 1
69. Select the incorrect statement?.
A. The pressure intensity at vena contracta is atmospheric
B. Contraction is least at vena contracta
C. Stream lines are parallel throughout the jet at vena contracta
D. Coefficient of contraction is always less than one.
Answer = Stream lines are parallel throughout the jet at vena contracta
70. Which of the following is an incorrect statement ?.
A. Coefficient of contraction of a venturimeter is unity
B. Flow nozzle is cheaper than venturimeter but has higher energy loss
C. Discharge is independent of orientation of venturimeter whether it is horizontal, vertical or inclined
D. None of the above statement is correct..
Answer = None of the above statement is correct.
71. A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the center of bottom is___________________?.
A. zero
B. one-fourth its value when cylinder was full
C. one-half its value when cylinder was full
D. cannot be predicted from the given data.
Answer = zero
72. When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies________________?.
A. linearly with radial distance
B. as the square of the radial distance
C. inversely as the square of the radial distance
D. inversely as the radial distance.
Answer = as the square of the radial distance
73. The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as__________________?.
A. center of gravity
B. center of buoyancy
C. center of pressure
D. metacentre.
Answer = center of pressure
74. If the weight of a body immersed in a fluid exceeds the buoyant force, then the body will________________?.
A. rise until its weight equals the buoyant force
B. tend to move downward and it may finally sink
C. float
D. none of the above.
Answer = tend to move downward and it may finally sink
75. A floating body is said to be in a state of stable equilibrium_________________?.
A. when its metacentric height is zero
B. when the metacentre is above the centre of gravity
C. when the metacentre is below the centre of gravity
D. only when its centre of gravity is below its centre of buoyancy.
Answer = when the metacentre is above the centre of gravity
76. A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of________________?.
A. 3.75 m
B. 4.0 m
C. 4.2m
D. 4.5m.
Answer = 4.2m
77. The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is______________?.
A. at the centroid of the submerged area
B. always above the centroid of the area
C. always below the centroid of the area
D. none of the above.
Answer = always below the centroid of the area
78. Newton's law of viscosity relates________________?.
A. intensity of pressure and rate of angular deformation
B. shear stress and rate of angular deformation
C. shear stress, viscosity and temperature
D. viscosity and rate of angular deformation.
Answer = shear stress and rate of angular deformation
79. The viscosity of a gas_______________?.
A. decreases with increase in temperature
B. increases with increase in temperature
C. is independent of temperature
D. is independent of pressure for very high pressure intensities.
Answer = increases with increase in temperature
80. If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then the kinematic viscosity of that fluid in stokes is__________________?.
A. 0.25
B. 0.50
C. 1.0
D. none of the above.
Answer = 1.0
81. An ideal fluid is_______________?.
A. one which obeys Newton's law of viscosity
B. frictionless and incompressible
C. very viscous
D. frictionless and compressible.
Answer = frictionless and incompressible
82. Pascal-second is the unit of______________?.
A. pressure
B. kinematic viscosity
C. dynamic viscosity
D. surface tension.
Answer = dynamic viscosity
83. The unit of kinematic viscosity is_______________?.
A. gm/cm-sec2
B. dyne-sec/cm2
C. gm/cm2-sec
D. cm2/sec.
Answer = cm2/sec
84. Select the correct statement?.
A. The absolute roughness of a pipe de-creases with time
B. A pipe becomes smooth after using for long time
C. The friction factor decreases with time
D. The absolute roughness increases with time.
Answer = The absolute roughness increases with time
85. A pitot tube is used to measure.
A. pressure.
B. difference in pressure.
C. velocity of flow.
D. none of these..
Answer = velocity of flow
86. The thickness of a sharp crested weir is kept less than.
A. one-third of the height of water on the sill.
B. one-half of the height of water on the sill.
C. one-fourth of the height of water on the sill.
D. two-third of the height of water on the sill.
Answer = one-half of the height of water on the sill
87. The property of steam function ψ is :.
A. ψ is constant everwhere on any stream line.
B. the flow around any path in the fluid is zero for continuous flow.
C. the rate of change of ψ with distance in an arbitrary direction, is proportional to the component of velocity normal to that direction.
D. all the above..
Answer = all the above.
88. The maximum vacuum created at the summit of a syphon is.
A. 2.7 m of water.
B. 7.4 m of water.
C. 5.5 m of water.
D. none..
Answer = 7.4 m of water
89. If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.1 kg/cm2, the pressure at a depth of 2.5 m, is.
A. 1 metre of water.
B. 2 metres of water.
C. 3 metres of water.
D. 3.5 metres of water.
Answer = 3 metres of water
90. The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at its centroid, if.
A. area is horizontal.
B. area is vertical.
C. area is inclined.
D. all the above..
Answer = all the above.
91. If the volume of a liquid weighing 3000 kg is 4 cubic metres, 0.75 is its.
A. specific weight.
B. specific mass.
C. specific gravity.
D. none of these..
Answer = specific gravity
92. Bernoulli's equation assumes that.
A. fluid is non-viscous.
B. fluid is homogeneous.
C. flow is steady.
D. all the above..
Answer = all the above.
93. A syphon is used.
A. to connect water reservoirs at different levels intervened by a hill.
B. to supply water to a town from higher level to lower level.
C. to fill up a tank with water at higher level from a lower level.
D. none of these..
Answer = to connect water reservoirs at different levels intervened by a hill
94. Most economical section of a circular channel for maximum discharge.
A. depth of water = 0.95 diameter of circular section.
B. hydraulic mean depth = 0.286 diameter of circular section.
C. wetted perimeter = 2.6 diameter of circular section.
D. all the above..
Answer = all the above.
95. The ratio of maximum velocity to average velocity of viscous fluid through a circular pipe is.
A. 0.5.
B. 0.75.
C. 1.25.
D. 2.0.
Answer = 2.0
96. The shear stress distribution in viscous fluid through a circular pipe is :.
A. maximum at the centre.
B. maximum at the inside of surface.
C. same throughout the section.
D. none of these..
Answer = same throughout the section
97. The side slope of Cipolletti weir is generally kept.
A. 1 to 4.
B. 1 to 3.
C. 1 to 2.
D. 31-Dec-1899.
Answer = 1 to 4
98. The momentum correction factor (β) for the viscous flow through a circular pipe is.
A. 1.25.
B. 1.33.
C. 1.5.
D. 1.66.
Answer = 1.33
99. A piezometer opening in pipes measures.
A. velocity head.
B. static pressure.
C. total pressure.
D. negative static pressure..
Answer = static pressure
100. An independent mass of a fluid does not posses.
A. elevation energy.
B. kinetic energy.
C. pressure energy.
D. none of these..
Answer = pressure energy
101. A short tube mouthpiece will not run full at its outlet if the head under which the orifice works, is.
A. less than 12.2 m of the water.
B. more than 12.2 m of the water.
C. equal of 12.2 m of water.
D. none of these..
Answer = more than 12.2 m of the water
102. Hydrostatic pressure on a dam depends upon its.
A. length.
B. depth.
C. shape.
D. both (b) and (c)..
Answer = both (b) and (c).
103. Maximum efficiency of transmission of power through a pipe, is.
A. 0.25.
B. 0.333.
C. 0.5.
D. 66.67%..
Answer = 66.67%.
104. An ideal flow of a liquid obeys.
A. Continuity equation.
B. Newton's law of viscosity.
C. Newton's second law of motion.
D. dynamic viscosity law,.
Answer = Continuity equation
105. Reynold number is the ratio of initial force and.
A. viscosity.
B. elasticity.
C. gravitational force.
D. surface tension..
Answer = viscosity
106. When a body is totally or partially immersed in a fluid, it is buoyed up by a force equal to.
A. weight of the body.
B. weight of the fluid displaced by the body.
C. weight of the body and fluild displaced by the body.
D. difference of weights of the fluid displaced and that of the body.
Answer = weight of the fluid displaced by the body
107. If the total head of the nozzle of a pipe is 37.5 m and discharge is 1 cumec, the power generated is.
A. 400 H.P..
B. 450 H.P..
C. 500 H.P..
D. 550 H.P..
Answer = 500 H.P.
108. The phenomenon occuring in an open channel when a rapidly flowing stream abruptly changes to a slowly flowing stream causing a distinct rise of liquid surface, is.
A. water hammer.
B. hydraulic jump.
C. critical discharge.
D. none of these..
Answer = hydraulic jump
109. The horizontal component of the force on a curved surface is equal to.
A. weight of liquid vertically below the curved surface.
B. force on a vetical projection of the curved surface.
C. product of pressure at its centroid and the area.
D. weight of liquid retained by the curved area..
Answer = force on a vetical projection of the curved surface
110. The radius of gyration of the water line of a floating ship is 4 m and its metacentric height is 72.5 cm. The period of oscillation of the ship, is.
A. π.
B. 2π.
C. 3π.
D. 4π.
Answer = 3π
111. Differential manometers are used to measure.
A. pressure in water channels, pipes, etc..
B. difference in pressure at two points.
C. atmospheric pressure.
D. very low pressure..
Answer = difference in pressure at two points
112. Liquids.
A. cannot be compressed.
B. do not occupy definite shape.
C. are not affected by change in pressure and temperature.
D. none of these..
Answer = do not occupy definite shape
113. The ratio of the inertia and gravitational force acting in any flow, ignoring other forces, is called.
A. Euler number.
B. Frode number.
C. Reynold number.
D. Weber number..
Answer = Frode number
114. A rectangular channel 6 m wide and 3 m deep and having a bed slope as 1 in 2000 is running full. If Chezy's constant C = 54.8, pick up the correct specification of the channel from the following :.
A. hydraulic mean depth = 1.5 m.
B. Velocity of flow = 1.5 m/sec.
C. Rate of flow = 27 m3/sec.
D. All the above..
Answer = All the above.
115. Non-over flow double curvature concrete arch, is provided in.
A. Bhakra dam.
B. Hirakund dam.
C. Nagarjuna Sagar dam.
D. Idukki dam..
Answer = Idukki dam.
116. For the most economical trapezoidal open channel,.
A. half of the top width must be equal to one of the sloping sides.
B. the hydraulic mean depth must be equal to half the depth of flow.
C. the semicircle drawn with top width as diameter must touch the three sides of the channel.
D. All of these..
Answer = All of these.
117. Hydraulic ram is a device.
A. for lifting water without an electric motor.
B. for accelerating water flow.
C. for lifting heavy loads.
D. none of these..
Answer = for lifting water without an electric motor
118. Gauge pressure is.
A. absolute pressure - atmospheric pressure.
B. absolute pressure + atmospheric pressure.
C. atmospheric pressure - absolute pressure.
D. none of these..
Answer = absolute pressure - atmospheric pressure
119. If jet of water coming out from a nozzle with a velocity 9.81 m/s, the angle of elevation being 30°, the time to reach the highest point is.
A. 0.25 s.
B. 0.50 s.
C. 1.0 s.
D. 1.5 s..
Answer = 0.50 s
120. The discharge through a 100 mm diameter external mouth piece fitted to the side of a large vessel is 0.05948 m3/s. The head over the mouth piece is.
A. 2 m.
B. 2.5 m.
C. 3.0 m.
D. 4.0 m..
Answer = 4.0 m.
121. If cohesion between the molecules of a fluid is more than adhesion between the fluid and glass, the free level of fluid in a dipped glass tube will be.
A. higher than the surface of liquid.
B. same as the surface of liquid.
C. lower than the surface of liquid.
D. none of these..
Answer = lower than the surface of liquid
122. The continuity equation.
A. expresses the relationship between work and energy.
B. relates the momentum per unit volume between two points on a stream line.
C. relates mass rate of flow along a stream line.
D. requires that Newton's second law of motion be satisfied at every point in fluid..
Answer = relates mass rate of flow along a stream line
123. Water displaced by a floating wooden block of density 0.75, 5 m long, 2 m wide and 3 m high, is.
A. 17.5 m3.
B. 20.0 m3.
C. 22.5 m3.
D. 25 km3..
Answer = 22.5 m3
124. In pipe lines, a surge tank is provided.
A. to relieve the pressure due to water hammer.
B. to provide additional water head.
C. to overflow the pipe line when suddenly closed.
D. to remove the frictional loss in pipe..
Answer = to relieve the pressure due to water hammer
125. Total head of a liquid particle in motion is the sum of.
A. potential head and kinetic head.
B. kinetic head and pressure head.
C. potential head and pressure head.
D. potential head, kinetic head and pressure head..
Answer = potential head, kinetic head and pressure head.
126. The velocity distribution of viscous fluid through a circular/pipe is :.
A. hyperbolic.
B. circular.
C. parabolic.
D. elliptical..
Answer = parabolic
127. Mercury is generally used in barometers because.
A. its vaour pressure is practically zero.
B. the height of the barometer will be less.
C. it is a best liquid.
D. both (a) and (b) above.
Answer = both (a) and (b) above
128. Flow in pipes is laminar if Reynold number is.
A. less than 2100.
B. more than 3000.
C. between 2100 and 3000.
D. none of these..
Answer = less than 2100
129. In flow, the liquid particles may possess.
A. potential energy.
B. kinetic energy.
C. pressure energy.
D. all the above..
Answer = all the above.
130. Euler's equation for the motion of liquids assumes that.
A. fluid is viscous.
B. fluid is homogeneous and incompressible.
C. velocity of flow is non-uniform over the section.
D. flow is unsteady along the stream line..
Answer = fluid is homogeneous and incompressible
131. The height of water level in a tank above the centre of a circular hole 2.5 cm in diameter is 50 m. The velocity of water flowing through the hole, is.
A. 31.1 m/sec.
B. 31.2 m/sec.
C. 31.3 m/sec.
D. 31.4 m/sec..
Answer = 31.3 m/sec
132. A steady uniform flow is through.
A. a long pipe at decreasing rate.
B. a long pipe at constant rate.
C. an expanding tube at constant rate.
D. an expanding tube at increasing rate.
Answer = a long pipe at constant rate
133. Cavitation is caused by.
A. Low pressure.
B. High pressure.
C. Low velocity.
D. High velocity.
Answer = Low pressure
134. Mach number is the ratio of inertia force to.
A. viscosity.
B. surface tension.
C. gravitational force.
D. elasticity..
Answer = elasticity.
135. The main assumption of Bernoulli's equation is :.
A. The velocity of energy of liquid particle, across any cross-section of a pipe is uniform.
B. No external force except the gravity acts on the liquid.
C. There is no loss of energy of the liquid while flowing.
D. All the above..
Answer = All the above.
136. For critical depth of flow of water in open channels, fc the specific energy must be :.
A. minimum.
B. maximum.
C. average of maximum and minimum.
D. None of these..
Answer = minimum
137. If the forces are due to inertia and gravity, and frictional resistance plays only a minor role, the design of the channels is made by comparing.
A. Reynold number.
B. Froude number.
C. Weber number.
D. Mach number..
Answer = Froude number
138. The discharge over a Cipolletti weir of length 2.185 m when the head over the weir is 1 m, is.
A. 2.0 m3.
B. 2.5 m3.
C. 3.0 m3.
D. 4.0 m3..
Answer = 4.0 m3.
139. The velocity of the fluid particle at the centre of the pipe section, is.
A. minimum.
B. maximum.
C. equal throughout.
D. none of these..
Answer = maximum
140. Due to decrease of diameter of the droplet, inside pressure intensity.
A. increases.
B. decreases.
C. remains unaffected.
D. None of these..
Answer = increases
141. In order to avoid capillary correction, the minimum diameter of a manometer used for measuring pressure, should be.
A. 2 mm.
B. 4 mm.
C. 6 mm.
D. 8 mm.
Answer = 6 mm
142. When water flows over a rectangular suppressed weir, the negative pressure created beneath the nappe.
A. increases the discharge.
B. decreases the discharge.
C. does not effect the discharge.
D. none of these..
Answer = increases the discharge
143. Barometres are used to measure.
A. pressure in water channels, pipes etc..
B. difference in pressure at two points.
C. atmospheric pressure.
D. very low pressure.
Answer = atmospheric pressure
144. For most economical rectangular section of a channel, the depth is kept.
A. one-fourth of the width.
B. three times the hydraulic radius.
C. half the width.
D. hydraulic mean depth.
Answer = half the width
145. In a centrifugual pump casing, the flow of water leaving the impeller, is.
A. rectilinear flow.
B. radial flow.
C. free vortex motion.
D. forced vertex..
Answer = free vortex motion
146. In fluids, steady flow occurs when.
A. conditions of flow change steadily with time.
B. conditions of flow do not change with time at a point.
C. conditions of flow remain the same at adjacent point.
D. velocity vector remains constant at a point..
Answer = conditions of flow do not change with time at a point
147. From a nozzle exposed to atmosphere, the liquid jet traverses.
A. a straight line.
B. a circular path.
C. an elliptical path.
D. a parabolic path..
Answer = a parabolic path.
148. To avoid the force of surface tension in an inclined manometer, the minimum angle of inclination is.
A. 2°.
B. 3°.
C. 4°.
D. 5°.
Answer = 4°
149. An orifice is taken as large if.
A. (H2 - H1) > H.
B. (H2 - H1) > H/4.
C. (H2 - H1) > H/2.
D. (H2 - H1) > H/3.
Answer = (H2 - H1) > H/3
150. A closed cylindrical vessel of 100 cm diameter and 200 cm high is completely filled with a liquid (sp. weight 1600 kg/m3) when rotated about its vertical axis at 100 r.p.m. The total pressure on its lid, is.
A. 459 kg.
B. 549 kg.
C. 945 kg.
D. 954 kg.
Answer = 954 kg
151. For exerting a pressure of 4.8 kg/cm2, the depth of oil (specific gravity 0.8), should be.
A. 40 cm.
B. 41 cm.
C. 56 cm.
D. 60 cm.
Answer = 60 cm
152. A cylindrical vessel 40 cm high is revolved about its vertical axis so that the water touches the bottom when it just spills out. If the radius of the cylinder is 5 cm, the angular velocity of rotation, is.
A. 2 rad/sec.
B. 3 rad/sec.
C. 4 rad/sec.
D. 5 rad/sec.
Answer = 2 rad/sec
153. For the flow of liquid from an open ended tube (or nozzle) leading to the formation of spray of liquid drops, the number generally applied, is.
A. Froude number.
B. Weber number.
C. Reynold number.
D. Mach number..
Answer = Weber number
154. To avoid vapourisation, pipe lines are laid over the ridge so that these are above the hydraulic gradient line, not more than.
A. 2.4 m.
B. 6.4 m.
C. 10.0 m.
D. 5.0 m..
Answer = 6.4 m
155. A jet projected at an angle of 45θ, 40 m from the foot of a vertical column, just reaches the top of the column. The height of the column is.
A. 15 m.
B. 20 m.
C. 30 m.
D. 40 m.
Answer = 40 m
156. If Cv, Cc, Cd and Cr are the hydraulic coefficients of an orifice, then.
A. Cd = CcCv.
B. Cr = 1 + Cv2/Cd.
C. Cv = Cc + Cd.
D. Cc = Cv/Cd.
Answer = Cd = CcCv
157. Atmospheric pressure varies with.
A. altitude.
B. temperature.
C. weather conditions.
D. all of the above..
Answer = all of the above.
158. The magnitude of water hammer in a pipe depends upon.
A. speed at which value is closed.
B. length of the pipe line.
C. elastic properties of the pipe material.
D. all the above..
Answer = all the above.
159. If velocities of fluid particles vary from point to point in magnitude and direction, as well as from instant to instant, the flow is said to be.
A. laminar.
B. turbulent flow.
C. uniform flow.
D. non-uniform flow..
Answer = turbulent flow
160. The rise of the liquid along the walls of a revolving cylinder above the initial level, is.
A. greater than the depression of the liquid at the axis of rotation.
B. lesser than the depression of the liquid at the axis of rotation.
C. the same as the depression of the liquid at the axis of rotation.
D. none of these..
Answer = the same as the depression of the liquid at the axis of rotation
161. Fluids change the volume under external presssure due to.
A. plasticity.
B. viscosity.
C. compressibility.
D. none of these..
Answer = compressibility
162. Discharge over an ogee weir remains the same as that of.
A. sharp crested weir.
B. triangular weir.
C. cippoletti weir.
D. drowned weir..
Answer = cippoletti weir
163. When no air is left below the nappe and water stream adheres to the down stream face of the weir, it is known as.
A. free nappe.
B. depressed nappe.
C. clinging nappe.
D. none of these..
Answer = clinging nappe
164. The best side slope for most economical trapezoidal section, is.
A. 30°.
B. 45°.
C. 60°.
D. None of these..
Answer = 60°
165. The following is not a laminar flow.
A. Flow of oil in measuring instruments.
B. Flow in beds in ground water.
C. Rise of water in plants through roots.
D. Flow in water pipe lines..
Answer = Flow in water pipe lines.
166. Which one of the following statements is true ?.
A. The value of kinetic energy correction factor for turbulent flow lies between 1.03 to 1.06.
B. The value of kinetic energy correction factor for laminar flow is 2.
C. The practical value of kinetic energy correction factor for turbulent flow is unity.
D. all the above..
Answer = all the above.
167. Uniform flow is said to occur when.
A. size and shape of the cross-section in a particular length remain constant.
B. size and shape of the cross-section change along a length.
C. frictional loss in the particular length of the channel will the more than the drop in its elevation.
D. frictional loss in the particular length of the channel, will be less than the drop in elevation..
Answer = size and shape of the cross-section in a particular length remain constant
168. Molecules of fluids get attracted due to.
A. capillarity action.
B. surface tension.
C. adhesion.
D. cohesion.
Answer = adhesion
169. Cappoletti weir is a.
A. rectangular weir whose length is kept 3 times the height of the water above sill.
B. triangular weir whose notch angle is 90°.
C. trapezoidal weir, whose sides slope 1 horizontal to 2 verticals.
D. a combination of rectangular and triangular weirs..
Answer = trapezoidal weir, whose sides slope 1 horizontal to 2 verticals
170. On an inclined plane, centre of pressure is located.
A. at the centroid.
B. above the centroid.
C. below the centroid.
D. anywhere..
Answer = below the centroid
171. Atmospheric pressure is equal to water column head of.
A. 9.81 m.
B. 5.0 m.
C. 10.30 m.
D. 7.5 m..
Answer = 10.30 m
172. Shear stress is directly proportional to.
A. the velocity.
B. the shear strain.
C. the viscosity.
D. the velocity..
Answer = the shear strain
173. To avoid an interruption in the flow of a syphon, an air vessel is provided.
A. at the inlet.
B. at the outlet.
C. at the summit.
D. at any point between intet and outlet..
Answer = at the summit
174. Pick up the correct statement from the following :.
A. Total energy gradient is the graphical representation of the total head at any section of a pipe line.
B. Vertical distance between the total energy line and hydraulic grade line is equal to the velocity head.
C. Vertical distance between the total energy line and total energy gradient represents loss of head.
D. all the above..
Answer = all the above.
175. A fluid particle may possess the displacement of.
A. translation.
B. rotation.
C. distortion.
D. all the above..
Answer = all the above.
176. Pick up the correct statement from the following :.
A. When the length of the tube is equal to diameter of the internal mouth piece, the jet of liquid comes out without touching the sides of the tube.
B. When the length of the tube is three times the diameter of the internal mouth piece, the jet diameter is equal to diameter of the tube..
C. both (a) and (b).
D. Neither (a) nor (b)..
Answer = both (a) and (b)
177. Piezometers are used to measure.
A. pressure in water channels, pipes etc..
B. difference in pressure at two points.
C. atmospheric pressure.
D. very low pressure..
Answer = very low pressure.
178. Most economical section of a triangular channel, is.
A. equilateral triangle.
B. right angled triangle.
C. isosceles triangle with 45° vertex angle.
D. right angled triangle with equal sides..
Answer = right angled triangle with equal sides.
179. In an open tube, free surface of mercury remains.
A. horizontal.
B. curved upwards.
C. curved downwards.
D. none of these..
Answer = curved downwards
180. Manometers are used to measure.
A. pressure in water channels, pipes etc..
B. difference in pressure at two points.
C. atmospheric pressure.
D. very low pressure..
Answer = pressure in water channels, pipes etc.
181. For maximum horse power of a nozzle, the head supplied must be equal to.
A. head loss in the pipe due to friction.
B. twice the head loss in the pipe due to friction.
C. thrice the head loss in the pipe due to friction.
D. four times the head loss in the pipe due to friction..
Answer = thrice the head loss in the pipe due to friction
182. The ratio of frictional factor and coefficient of friction used in general equation for a head loss in a pipe, is.
A. 1.0.
B. 2.0.
C. 3.0.
D. 4.0.
Answer = 4.0
183. Flow in pipes is turbulent if Reynold number is.
A. less than 2100.
B. more than 3000.
C. between 2100 and 3000.
D. none of these..
Answer = more than 3000
184. Back water curve is caused if.
A. friction head loss is more than the bed slope.
B. pressure is due to weir in the channel.
C. there is an increase in width of the channel.
D. none of these..
Answer = pressure is due to weir in the channel
185. Power transmitted through a pipe is maximum when friction head loss, is.
A. one-half of the total head supplied.
B. one-third of the total head supplied.
C. one-fouth of the total head supplied.
D. equal to the total head supplied..
Answer = one-third of the total head supplied
186. The specific weight of water is 1000 kg/m3.
A. at normal pressure of 760 mm.
B. at 4°C temperature.
C. at mean sea level.
D. all the above..
Answer = all the above.
187. Specific weight of liquid.
A. remains constant at every place.
B. does not remain constant at every place.
C. varies from place to place on the earth.
D. does not vary on any other planet..
Answer = does not vary on any other planet.
188. Manning's formula is used for.
A. flow in open channels.
B. head loss due to friction in open channels.
C. head loss due to friction in pipes flowing full.
D. flow in pipes..
Answer = head loss due to friction in open channels
189. A non-uniform steady flow is through.
A. a long tube at a decreasing rate.
B. an expanding tube at constant rate.
C. an expanding tube at increasing rate.
D. a long pipe at increasing rate..
Answer = an expanding tube at constant rate
190. An ideal fluid is.
A. incompressible.
B. compressible.
C. compressible and non-viscous.
D. slightly affected by surface torque..
Answer = compressible and non-viscous
191. Equation of continuity of flow is based on the principle of conservation of.
A. mass.
B. momentum.
C. force.
D. none of these..
Answer = mass
192. Pick up the correct statement from the following :.
A. Discharge over a triangular notch is proportional to H5/2.
B. Discharge over a rectangular notch is proportional to H3/2.
C. Both (a) and (b).
D. Neither (a) nor (b)..
Answer = Both (a) and (b)
193. The flow in open channel is said to be subcritical if the Froude number is.
A. less than 1.0.
B. equal to 1.0.
C. greater than 1.0.
D. none..
Answer = less than 1.0
194. In C.G.S. system the unit of visocity is.
A. dyne.
B. joule.
C. poise.
D. Newton.
Answer = poise
195. The notch angle for maximum discharge over a triangular notch, is.
A. 30°.
B. 60°.
C. 90°.
D. 120°.
Answer = 90°
196. In an inclined pipe, the pressure difference at its two ends is due to.
A. sudden head drop at inlet.
B. exit head drop.
C. frictional loss head.
D. all the above..
Answer = all the above.
197. Weber number is the ratio of inertia force to.
A. surface tension.
B. gravitational force.
C. elasticity.
D. viscosity..
Answer = surface tension
198. Though angle of deviation of liquid is more in internal mouth piece, the contraction of the jet, is.
A. more in the internal mouth piece.
B. less in the internal mouth piece.
C. equal to external mouth piece.
D. none of these..
Answer = more in the internal mouth piece
199. The width of a weir with end contraction, is.
A. equal to the width of the channel.
B. less than the width of the channel.
C. half the width of the channel.
D. none of these..
Answer = less than the width of the channel
200. An open container filled with water is moved vertically upward with a uniform linear acceleration. The pressure at its bottom will be.
A. greater than static pressure.
B. equal to static pressure.
C. lesser than static pressure.
D. none of these..
Answer = greater than static pressure
201. The gases are considered incompressible if Match number is.
A. equal to 1.0.
B. equal to 1.5.
C. is more than 0.5.
D. less than 0.2.
Answer = less than 0.2
202. The flow in which each liquid particle has a definite path and the paths of adjacent particles do not cross each other, is called.
A. stream line flow.
B. uniform flow.
C. steady flow.
D. turbulent flow..
Answer = stream line flow
203. The dimensionless parameter not applicable to flowing liquids, is.
A. Reynold number.
B. Weber number.
C. Pressure coefficient.
D. Kinematic viscosity.
Answer = Kinematic viscosity
204. The pressure rise due to water hammer depends upon.
A. the velocity of flow of water in the pipe.
B. the length of pipe.
C. time taken to close the valve.
D. All of above..
Answer = All of above.
205. In a two dimensional flow if the components of the velocity are u = ax ; v = by, the point where no motion occurs, is known as.
A. critical point.
B. neutral point.
C. stagnation point.
D. stationary point.
Answer = stagnation point
206. Most economical section of a circular channel for maximum velocity, is if,.
A. depth of water = 0.810 diameter.
B. hydraulic mean depth = 0.304 diameter.
C. wetted perimeter = 2.245 diameters.
D. all the above..
Answer = all the above.
207. For a most economical rectangular channel, the width of the channel must be.
A. equal to depth of flow.
B. twice the depth of flow.
C. half the depth of flow.
D. None of these..
Answer = twice the depth of flow
208. The hydrostatic force acts through.
A. centre of pressure.
B. centre of top edge.
C. centre of bottom edge.
D. metacentre..
Answer = centre of pressure
209. In an inclined position, a venturimeter records.
A. more reading.
B. less reading.
C. same reading.
D. none of these..
Answer = same reading
210. In a short cylindercial external mouthpiece, the venacontracta occurs at a distance from the outlet of orifice equal to.
A. diameter of the orifice.
B. one-fourth the diameter of the orifice.
C. one-third the diameter of the orifice.
D. two-third the diameter of the orifice.
Answer = one-fourth the diameter of the orifice
211. If the pressure at the inlet of a pipe is 90 kg/cm2 and pressure drop over the pipe line is 10 kg/cm2, the efficiency of transmission, is.
A. 0.666.
B. 0.777.
C. 0.555.
D. 88.8%..
Answer = 88.8%.
212. Pick up the incorrect statement from to following regarding triangular notch :.
A. For measuring low discharge, it gives more accurate result.
B. Only one reading (i.e. H) is required for computation of discharge.
C. Ventilation is necessary.
D. None of these..
Answer = Ventilation is necessary
213. The flow in a channel is said to be non-uniform, if.
A. free water surface of an open channel is not parallel to the bed of channel.
B. head needed to overcome frictional reistance is less than the drop in elevation of channel bed.
C. head needed to overcome frictional resistance is more than the drop in elevation of channel bed.
D. all the above..
Answer = all the above.
214. Flow net can be drawn only if the flow is.
A. turbulent.
B. rotational.
C. distortion.
D. none of these..
Answer = distortion
215. The flow in open channel is laminar if the Reynold number is.
A. less than 500.
B. more than 500.
C. 1000.0.
D. none of these..
Answer = less than 500
216. Centre of buoyancy is.
A. centroid of the floating body.
B. centroid of the fluid displaced.
C. centre of pressure of the displaced liquid.
D. none of these..
Answer = centroid of the fluid displaced
217. The intensity of pressure due to sudden closure of a valve of a pipe in which water flows with velocity v, is directly proportional to :.
A. square root of the bulk modulus of elasticity of water.
B. bulk modulus of elasticity of water.
C. specific weight of water.
D. none of these..
Answer = square root of the bulk modulus of elasticity of water
218. Total energy line is.
A. pressure head.
B. datum head.
C. kinetic head.
D. All the above..
Answer = All the above.
219. For critical flow, the Froude number is :.
A. 1.0.
B. less than 1.0.
C. more than 1.0.
D. 2.0.
Answer = 1.0
220. A stepped notch is a combination of.
A. rectangular notches of different sizes.
B. triangular notches of different sizes.
C. rectangular and triangular notches.
D. all the above..
Answer = rectangular notches of different sizes
221. The centre of pressure of a vertical plane immersed in a liquid is at.
A. centre of higher edge.
B. centre of lower edge.
C. centroid of the area.
D. none of these..
Answer = none of these.
222. A body of dimensions 1.5 m x 1.0 m x 2 m weighs 3000 kg in water. Its specific gravity is.
A. 0.8.
B. 0.9.
C. 1.0.
D. 1.1.
Answer = 1.1
223. An orifice is called a large orifice if water head, is.
A. twice the diameter of the orifice.
B. thrice the diameter of the orifice.
C. four times the diameter of the orifice.
D. five times the diameter of the orifice..
Answer = five times the diameter of the orifice.
224. When a liquid rotates at constant angular velocity about a vertical axis of a rigid body, the pressure.
A. increases linearly to its radial distance.
B. varies inversely as the altitude along any vertical line.
C. varies as the square of the radial distance.
D. decreases as the square of the radial distance.
Answer = varies as the square of the radial distance
225. For the two dimensional flow, the stream function is given by ψ = 2xy. The velocity at a point (3, 4) is.
A. 6 m/sec.
B. 8 m/sec.
C. 10 m/sec.
D. 12 m/sec.
Answer = 10 m/sec
226. A floating body attains stable equilibrium if its metacentre is.
A. at the centroid.
B. above the centroid.
C. below the centroid.
D. anywhere..
Answer = above the centroid
227. The unit of the viscosity is.
A. kg sec/m2.
B. Newton sec per m2.
C. Newton-sec2/m3.
D. m2 per sec..
Answer = Newton sec per m2
228. An ideal fluid.
A. is frictionless and incompressible.
B. obeys Newton's law of velocity.
C. is similar to gas.
D. is very viscous..
Answer = is frictionless and incompressible
229. In C.G.S. system the units of kinematic viscosity, is.
A. stoke.
B. poise.
C. Newton.
D. none of these..
Answer = stoke
230. A triangular notch is preferred to a rectangular notch because.
A. only one reading is required.
B. its formula is simple to remember.
C. it gives more accurate results for low discharge.
D. all the above..
Answer = all the above.
231. In case of laminar flow through a circular pipe,.
A. momentum correction factor is 1.33.
B. energy correction factor is 2.00.
C. both (a) and (b).
D. Neither (a) nor (b)..
Answer = both (a) and (b)
232. The pressure less than atmospheric , pressure, is known.
A. suction pressure.
B. vacuum pressure.
C. negative gauge pressure.
D. all the above..
Answer = all the above.
233. A rise or fall of liquid in a glass tube of a very small diameter when dipped is.
A. directly proportional to the force per unit length of periphery.
B. direcly proportional to the sine of the angle of contact.
C. directly proportional to the specific weight of liquid.
D. inversely proportional to the diameter of the glass tube..
Answer = directly proportional to the specific weight of liquid
234. To measure very low pressure, we use.
A. barometers.
B. piezometers.
C. manometers.
D. differential manometers..
Answer = manometers
235. A spherical load 900 kg is rolled through 9.8 m across the deck of a ship weighing 10, 000 kg. If the metacentric height of the ship is 5 metres, the angle of heel, is.
A. 10° 5'.
B. 10° 10'.
C. 10° 15'.
D. 10° 20'.
Answer = 10° 15'
236. Pick up the correct statement from the following :.
A. In incompressible flow the density of a fluid remains constant.
B. In compressible flow, the density of a fluid changes from point to point.
C. In uniform flow, the velocity of a fluid does not change with respect to length of flow direction.
D. All the above..
Answer = All the above.
237. Pick up the incorrect statement from the following :.
A. In radial flow, fluid flows such that pressure and velocity at any point change with respect to its distance from the central axis.
B. In radial flow, velocity of flow is in a radial direction.
C. In radial flow, flow may take place radially inward to or outward from the centre.
D. In radial flow, flow is one dimensional with stream lines parallel..
Answer = In radial flow, flow is one dimensional with stream lines parallel.
238. Chezy's formula is used to determine.
A. head loss due to friction in pipe.
B. velocity of flow in pipe.
C. velocity of flow in open channels.
D. none of these..
Answer = velocity of flow in open channels
239. The metacentric height of a body equals the distance between.
A. the centre of gravity and centre of buoyancy.
B. the metacentre and centre of gravity.
C. the centre of buoyancy and metacentre.
D. none of these..
Answer = the metacentre and centre of gravity
240. Discharge through a totally submerged orifice, is directly proportional to.
A. difference in elevation of water surfaces.
B. square root of the difference in elevation of water surface.
C. square root of the opening.
D. reciprocal of the area of the opening.
Answer = square root of the difference in elevation of water surface
241. Frictional loss of head includes the loss of energy due to.
A. viscosity.
B. turbulence.
C. both (a) and (b).
D. none of these..
Answer = none of these.
242. The length of hydraulic jump is roughly.
A. 2 to 3 times its height.
B. 3 to 5 times its height.
C. 5 to 7 times its height.
D. None of these..
Answer = 5 to 7 times its height
243. To ensure that water does not rise more than 100 cm above the crest, for a discharge of 5.00 m3/sec, the length of water will be.
A. 2.48 m.
B. 2.49 m.
C. 2.50 m.
D. 2.51 m..
Answer = 2.49 m
244. For a most economical trapezoidal open channel, the half of the top width must be equal to.
A. the bed width.
B. one sloping side.
C. the depth of flow.
D. None of these..
Answer = one sloping side
245. Pick up the correct statement regarding convergent divergent mouth piece from the following :.
A. It converges upto Venacontracta and then diverges.
B. In this mouth piece there is no loss of energy due to sudden enlargement.
C. The coefficient of discharge is unity.
D. All the above..
Answer = All the above.
246. The value of kinetic energy correction factor (a) for a laminar flow through a circular pipe, is.
A. 0.5.
B. 1.0.
C. l.5.
D. 2.0.
Answer = 2.0
247. One metric slug is equal to.
A. 1 kg wt.
B. 9.81 kg wt.
C. 9.81 kg mass.
D. 0.98 kg wt..
Answer = 9.81 kg mass
248. Falling drops of water become spheres due to.
A. adhesion.
B. cohesion.
C. surface tension.
D. viscosity..
Answer = surface tension
249. The most efficient channel section, is.
A. semi-circular.
B. rectangular.
C. triangular.
D. half hexagon in the form of trapezoid..
Answer = half hexagon in the form of trapezoid.
250. With a clinging nappe of a weir, the excess discharge, is.
A. 6% to 7%.
B. 8% to 10%.
C. 18% to 20%.
D. 25% to 30%.
Answer = 25% to 30%
251. For steady flow in open channels, which one of the following does not change :.
A. depth of flow.
B. velocity of flow.
C. rate of flow.
D. All of these..
Answer = All of these.
252. Equation of continuity of fluids is applicable only if.
A. flow is steady.
B. flow is compressive.
C. flow is one dimensional.
D. all the above..
Answer = all the above.
253. The flow in open channel is said to be critical if the Froude number is :.
A. less than 1.0.
B. equal to 1.0.
C. greater than 1.0.
D. None of these..
Answer = equal to 1.0
254. An orifice is an opening in a vessel with.
A. closed perimeter of regular shape through which water flows.
B. the water level of the liquid on the up stream side is below the top of the orifice.
C. partially full flow.
D. prolonged sides having length of 2 to 3 diameters of the opening in thick wall..
Answer = closed perimeter of regular shape through which water flows
255. The imaginary line drawn such that the tangents at its all points indicate the direction of the velocity of the fluid particles at each point, is called.
A. path line.
B. stream line.
C. potential line.
D. streak line..
Answer = stream line
256. A nozzle is fitted at the end of a pipe whose length is 320 m and diameter is 10 cm. If the value of f = 0.01, the diameter of the nozzle for the maximum transmission of power through the nozzle is.
A. 2.4 cm.
B. 2.5 cm.
C. 2.6 cm.
D. 2.7 cm..
Answer = 2.5 cm
257. When the whole fluid mass rotates either due to fluid pressure or gravity or rotation previously imparted, the motion is known as.
A. free vortex.
B. forced vortex.
C. non-potential vortex.
D. rotational vortex..
Answer = free vortex
258. For solving the problems is hydraulic engineering, the velocity used is.
A. velocity at the centre of pipe section.
B. average velocity of flow over a section.
C. mean of the velocities at the centre and that along the pipe surface.
D. none of these..
Answer = average velocity of flow over a section
259. The shape of fire hose nozzle is generally kept.
A. divergent.
B. convergent.
C. convergent divergent.
D. cylindrical..
Answer = convergent
260. The line joining the points to which the liquid rises in vertical piezometer tubes fitted at different cross-sections of a conduit, is known as.
A. hydraulic gradient.
B. piezometric line.
C. pressure grade line.
D. all the above..
Answer = all the above.
261. Practical fluids possess.
A. viscosity.
B. surface tension.
C. compressibility.
D. all the above..
Answer = all the above.
262. The depth of the centre of pressure on a vertical rectangular gate (4 m wide, 3 m high) with water upto top surface, is.
A. 1.0 m.
B. 1.5 m.
C. 2.0 m.
D. 2.5 m..
Answer = 2.0 m
263. The differential equation dp/ρ + gdz + vdv = 0 for a fluid motion is suggested by.
A. Bernoulli.
B. Cauchy-Riemann.
C. Laplace.
D. Leonard Euler..
Answer = Leonard Euler.
264. An open container filled with water is moved vertically downward with a uniform linear acceleration. The pressure at its bottom will be.
A. greater than static pressure.
B. equal to static pressure.
C. lesser than static pressure.
D. none of these..
Answer = lesser than static pressure
265. For uniform flow in canals.
A. there is a balance between the frictional loss and drop in elevation of the channel.
B. bed and free water surfaces of a channel are parallel to each other.
C. bed of channel represents the hydraulic gradient.
D. all the above..
Answer = all the above.
266. If H is height of the liquid above the sill, the effect of end contractions, according to Francis formula, is.
A. 0.1 H.
B. 0.2 H.
C. 0.3 H.
D. 0.4 H.
Answer = 0.1 H
267. Pick up the correct statement from the following :.
A. For maximum velocity of flow, the depth of water in the circular channel must be 0.81 times the diameter of the channel.
B. For maximum velocity, the hydraulic mean depth must be 0.3 times the diameter of circular channel.
C. For maximum discharge the depth of flow must be 0.95 times the diameter of circular channel.
D. All the above..
Answer = All the above.
268. In flowing liquids pitot tubes are used measure.
A. discharge.
B. pressure.
C. velocity.
D. depth..
Answer = velocity
269. Capillary rise of water is.
A. directly proportional to surface tension.
B. inversely proportional to water density.
C. inversely proportional to diameter of the tube.
D. All of these..
Answer = All of these.
270. A water tank partially filled with water is being carried on a truck moving with a constant horizontal acceleration. The level of the water.
A. rises on the front side of the tank.
B. falls on the back side of the tank.
C. remains the same at both sides of the tank.
D. rises on the back side and falls on the front side.
Answer = rises on the back side and falls on the front side
271. An error of 1% in measuring the head of water over the crest of a rectangular weir, produces an error in the discharge which is equal to.
A. 0.0125.
B. 0.015.
C. 0.0175.
D. 0.0225.
Answer = 0.015
272. Orifice-meter is used to measure.
A. pressure at the point.
B. discharge.
C. average speed.
D. velocity..
Answer = discharge
273. Pick up the correct statement from the following :.
A. Dimensional homogeneity means the dimensions of each term in an equation on both sides are equal.
B. Dimensionally homogeneous equations are independent of the system of units.
C. In dimensionally homogeneous equation, the powers of fundamental dimensions on either side of the equation are identical.
D. All the above..
Answer = All the above.
274. The ratio of inertia force of a flowing fluid and the viscous force of the liquid is called :.
A. Renold's number.
B. Froude's number.
C. Euler's number.
D. Weber's number..
Answer = Renold's number
275. Water belongs to.
A. Newtonian fluids.
B. non-Newtonian fluids.
C. compressible fluid.
D. none of these..
Answer = Newtonian fluids
276. Hydraulic radius is equal to.
A. area divided by the square of wetted perimeter.
B. area divided by wetted perimeter.
C. wetted perimeter divided by area.
D. square root of the area..
Answer = area divided by wetted perimeter
277. The acceleration f required to accelerate a rectangular tank containing water horizontally so that the slope of its free surface is 45°, is.
A. g/2.
B. g.
C. 2 g.
D. 2.5 g.
Answer = g
278. For solving network problems of pipes, necessary condition is.
A. continuity equation.
B. energy equation.
C. Darcy-Weisbach equation.
D. all the above..
Answer = all the above.
279. In a fluid flow a particle may posses.
A. elevation energy.
B. kinetic energy.
C. pressure energy.
D. all the above..
Answer = all the above.
280. In two dimensional flow the components of velocity are given by u = ax; v = by. The stream lines will be.
A. circular.
B. parabolic.
C. hyperbolic.
D. elliptical..
Answer = hyperbolic
281. For a most economical rectangular channel, the hydraulic mean depth, is equal to.
A. the depth of flow.
B. half the depth of flow.
C. one-third depth of flow.
D. None of these..
Answer = half the depth of flow
282. The instrument used for measuring the velocity of flow, is known as.
A. venturimeter.
B. orifice meter.
C. pitot tube.
D. none of these..
Answer = pitot tube
283. For a long pipe, the head loss.
A. at the entrance is ignored.
B. at the outlet is ignored.
C. at the entrance and outlet both are ignored.
D. due to friction is ignored..
Answer = at the entrance and outlet both are ignored
284. On a flow net diagram, the distance between two consecutive steam lines at two successive sections are 1 cm and 0.5 cm respectively. If the velocity at the first section is 1 m/sec, the velocity at the second is.
A. 1.0 m/sec.
B. 0.5 m/sec.
C. 2.0 m/sec.
D. 2.5 m/sec.
Answer = 2.0 m/sec
285. The flow is called rotational if its velocity normal to the plane of area is equal to.
A. angular velocity vector.
B. twice the angular velocity vector.
C. thrice the angular velocity vector.
D. none of these..
Answer = twice the angular velocity vector
286. Flow of water in pipes of diameter more than 3 metres, can be measured by.
A. pitot tube.
B. venturimeter.
C. orifice plate.
D. rotameter..
Answer = rotameter.
287. Hydraulic grade line.
A. remains above the centre line of conduit.
B. remains below the centre line of conduit.
C. remains parallel to the centre line of conduit.
D. may be above or below the centre line of conduit..
Answer = may be above or below the centre line of conduit.
288. If the Mach number for a fluid flow is less than 1, the flow is.
A. sonic.
B. supersonic.
C. sub-sonic.
D. none of these..
Answer = sub-sonic
289. Hydraulic coefficient of an orifice means the coefficient of.
A. velocity.
B. contraction.
C. resistance.
D. all the above..
Answer = all the above.
290. In a venturimeter, the divergent cone is kept.
A. shorter than convergent cone.
B. equal to covergent cone.
C. longer than convergent cone.
D. none of these..
Answer = longer than convergent cone
291. Specific weight of sea water is more than that of pure water because of.
A. dissolved air.
B. dissolved salts.
C. suspended matter.
D. all the above..
Answer = all the above.
292. Total pressure on the top of a closed cylindrical vessesl completely filled with liquid, is directly proportional to.
A. radius.
B. (radius)2.
C. (radius)3.
D. (radius)4.
Answer = (radius)4
293. Energy equation is usually applicable to.
A. non-uniform flow.
B. turbulent flow.
C. laminar flow.
D. steady flow..
Answer = steady flow.
294. Poise is the unit of.
A. viscosity.
B. velocity gradient.
C. mass density.
D. kinematic viscous..
Answer = viscosity
295. For mountaneous regions having steep slope, wagons for carrying liquid are made with bottom.
A. parallel to the road surface.
B. parallel to the horizontal surface.
C. inclined upward while moving upwards.
D. inclined downward while moving downwards..
Answer = parallel to the horizontal surface
296. The upper surface of the weir over which water flows, is known as.
A. vein.
B. nappe.
C. sill.
D. none of these..
Answer = sill
297. The ratio of the inertia and viscous forces acting in any flow, ignoring other forces, is called.
A. Euler number.
B. Frode number.
C. Reynold number.
D. Weber number..
Answer = Reynold number
298. To avoid the tendency of separation of liquid flow, the most suitable ratio of the diameters of the throat and the pipe, is.
A. 1/4 to 1/8.
B. 1/3 to 1/2.
C. 1/2 to 3/4..
D. none of these..
Answer = 1/3 to 1/2
299. Hydraulic energy is converted into another form of energy by hydraulic machines. What form of energy is that?.
A. Mechanical Energy.
B. Electrical Energy.
C. Nuclear Energy.
D. Elastic Energy.
Answer = Mechanical Energy
300. In hydraulic turbines, inlet energy is greater than the outlet energy..
A. TRUE.
B. FALSE.
C. Nothing can be said.
D. None of the mentioned.
Answer = TRUE
301. Which principle is used in Hydraulic Turbines?.
A. Faraday law.
B. Newton’s second law.
C. Charles law.
D. Braggs law.
Answer = Newton’s second law
302. Buckets and blades used in a turbine are used to:.
A. Alter the direction of water.
B. Switch off the turbine.
C. To regulate the wind speed.
D. To regenerate the power.
Answer = Alter the direction of water
303. _______________is the electric power obtained from the energy of the water..
A. Roto dynamic power.
B. Thermal power.
C. Nuclear power.
D. Hydroelectric power.
Answer = Hydroelectric power
304. Which energy generated in a turbine is used to run electric power generator linked to the turbine shaft?.
A. Mechanical Energy.
B. Potential Energy.
C. Elastic Energy.
D. Kinetic Energy.
Answer = Mechanical Energy
305. Hydraulic Machines fall under the category :.
A. Pulverizers.
B. Kinetic machinery.
C. Condensers.
D. Roto-dynamic machinery.
Answer = Roto-dynamic machinery
306. Which kind of turbines changes the pressure of the water entered through it?.
A. Reaction turbines.
B. Impulse turbines.
C. Reactive turbines.
D. Kinetic turbines.
Answer = Reaction turbines
307. Which type of turbine is used to change the velocity of the water through its flow?.
A. Kinetic turbines.
B. Axial flow turbines.
C. Impulse turbines.
D. Reaction turbines.
Answer = Impulse turbines
308. Which type of turbine is a Francis Turbine?.
A. Impulse Turbine.
B. Screw Turbine.
C. Reaction turbine.
D. Turgo turbine.
Answer = Reaction turbine
309. How many types of Reaction turbines are there?.
A. 5.0.
B. 4.0.
C. 3.0.
D. 9.0.
Answer = 5.0
310. Turgo Turbine is an impulsive turbine..
A. TRUE.
B. FALSE.
C. Nothing can be said.
D. None of the mentioned.
Answer = TRUE
311. Which kind of turbine is a Fourneyron Turbine?.
A. Inward flow turbine.
B. Outward flow turbine.
C. Mixed flow turbine.
D. Radial flow turbine.
Answer = Outward flow turbine
312. Maximum Number of jets, generally, employed in an impulse turbine without jet interference can be?.
A. 2.0.
B. 3.0.
C. 4.0.
D. 6.0.
Answer = 6.0
313. The overall efficiency of a reaction turbine is the ratio of.
A. Actual work available at the turbine to the energy imparted to the wheel.
B. Work done on the wheel to the energy (or head of water) actually supplied to the turbine.
C. Power produced by the turbine to the energy actually supplied by the turbine.
D. Actual work available at the turbine to energy imparted to the wheel.
Answer = Actual work available at the turbine to the energy imparted to the wheel
314. In a reaction turbine, the draft tube is used to _________.
A. To increase the head of water by an amount that is equal to the height of the runner outlet above the tail race.
B. To prevent air to enter the turbine.
C. To increase pressure energy of water.
D. To transport water to downstream.
Answer = To increase the head of water by an amount that is equal to the height of the runner outlet above the tail race
315. In reaction turbine hydraulic efficiency is______________.
A. Ratio of actual work at the turbine to the energy imparted to the wheel..
B. Ratio of work done on the wheel to energy that is supplied to the turbine..
C. Ratio of power produced by the turbine to the energy actually supplied by the turbine..
D. Ratio of Work done on the wheel to the energy (or head of water) actually supplied to the turbine..
Answer = Ratio of work done on the wheel to energy that is supplied to the turbine.
316. Consider an inward flow reaction turbine, here, water _______.
A. Flows parallel to the axis of the wheel.
B. Enters the wheel at the outer periphery and then flows towards the centre of the wheel.
C. Flow is partly radial and partly axial.
D. Enters at the centre of the wheel and then flows towards the outer periphery of the wheel.
Answer = Enters the wheel at the outer periphery and then flows towards the centre of the wheel
317. The working of which of the following hydraulic units is based on Pascal’s law?.
A. Air lift pump.
B. Hydraulic coupling.
C. Hydraulic press.
D. Jet pump.
Answer = Hydraulic press
318. Which kind of turbine is a Pelton Wheel turbine?.
A. Tangential flow turbine..
B. Radial flow turbine.
C. Outward flow turbine.
D. Inward flow turbine.
Answer = Tangential flow turbine.
319. IN what type of turbine water enters in radial direction and leaves axial direction?.
A. Tangential flow turbine.
B. Axial flow turbine.
C. Outward flow turbine.
D. Mixed flow turbine.
Answer = Mixed flow turbine
320. How many types of turbines can you classify on the basis of direction of flow through runner?.
A. 6.0.
B. 3.0.
C. 4.0.
D. 7.0.
Answer = 4.0
321. Into how many types can you classify radial flow turbines?.
A. 4.0.
B. 3.0.
C. 6.0.
D. 2.0.
Answer = 2.0
322. Into how many types can you classify turbines on basis of head at inlet?.
A. 3.0.
B. 4.0.
C. 6.0.
D. 5.0.
Answer = 3.0
323. Among the following which turbine requires more head?.
A. Pelton Turbine.
B. Kaplan Turbine.
C. Francis turbine.
D. Tube Turbine.
Answer = Pelton Turbine
324. Total head of turbines is_______.
A. Pressure head + Static head.
B. Kinetic head + Static head.
C. Static head + Pressure head.
D. Pressure head + Kinetic head + Static head.
Answer = Pressure head + Kinetic head + Static head
325. Head under which Kaplan turbine is operated______.
A. 10-70 meters.
B. 70 -100 meters.
C. 100-200 meters.
D. Above 200 meters.
Answer = 10-70 meters
326. Head under which Francis turbine is operated.
A. 10-70 meters.
B. 70-100 meters.
C. 100-200 meters.
D. 40 -600 meters.
Answer = 40 -600 meters
327. The turbine is preferred for 0 to 25 m head of water?.
A. Pelton wheel.
B. Kaplan turbine.
C. Tube turbine.
D. Francis turbine.
Answer = Kaplan turbine
328. Under what head is Pelton turbine operated?.
A. 20-50 meters.
B. 15-2000 meters.
C. 60-200 meters.
D. 50-500 meters.
Answer = 15-2000 meters
329. _____________ is difference between head race and tail race.
A. Gross head.
B. Net head.
C. Net positive suction head.
D. Manometric head.
Answer = Gross head
330. The head available at inlet of turbine.
A. Net positive suction head.
B. Gross head.
C. Net head.
D. Manometric head.
Answer = Net head
331. Head lost due to friction is given by k*f*L*v*v/D*2g where f- friction coefficient, L- length of pen stock, D- diameter of penstock and” k” is constant and its value is ____________.
A. 2.0.
B. 3.0.
C. 4.0.
D. 5.0.
Answer = 4.0
332. The difference between gross head and friction losses is ____________.
A. Net head.
B. Gross head.
C. Manometric head.
D. Net positive suction head.
Answer = Net head
333. _____________ is defined as ratio between power delivered to runner and power supplied at inlet of turbine..
A. Mechanical efficiency.
B. Volumetric efficiency.
C. Hydraulic efficiency.
D. Overall efficiency.
Answer = Hydraulic efficiency
334. Which among the following which is not an efficiency of turbine?.
A. Mechanical efficiency.
B. Volumetric efficiency.
C. Hydraulic efficiency.
D. Electrical efficiency.
Answer = Electrical efficiency
335. The ratio of power at the shaft of turbine and power delivered by water to runner is known as?.
A. Mechanical efficiency.
B. Volumetric efficiency.
C. Hydraulic efficiency.
D. Overall efficiency.
Answer = Mechanical efficiency
336. The product of mechanical efficiency and hydraulic efficiency is known as?.
A. Mechanical efficiency.
B. Volumetric efficiency.
C. Hydraulic efficiency.
D. Overall efficiency.
Answer = Overall efficiency
337. Among the following which turbine has highest efficiency?.
A. Kaplan turbine.
B. Francis turbine.
C. Pelton turbine.
D. Propeller turbine.
Answer = Kaplan turbine
338. _____________ is ratio of volume of water actually striking the runner and volume of water supplied to turbine?.
A. Mechanical efficiency.
B. Volumetric efficiency.
C. Hydraulic efficiency.
D. Overall efficiency.
Answer = Volumetric efficiency
339. In the expression for overall efficiency of turbine, which is p/(k*g*q*h), where “k” is known as.
A. Density of liquid.
B. Specific density of liquid.
C. Volume of liquid.
D. Specific gravity of liquid.
Answer = Density of liquid
340. The expression for maximum hydraulic efficiency of pelton turbine is given by?.
A. (1+cos k)/2 where k is outlet blade angle.
B. (2+cos k)/2 where k is outlet blade angle.
C. (3+cos k)/2 where k is outlet blade angle.
D. (4+cos k)/2 where k is outlet blade angle.
Answer = (1+cos k)/2 where k is outlet blade angle
341. To obtain maximum hydraulic efficiency of pelton turbine, blade velocity should be ___________ Times the inlet velocity of jet..
A. Half.
B. One quarter.
C. Twice.
D. Thrice.
Answer = Half
342. Among the following which turbine has least efficiency?.
A. Pelton turbine.
B. Kaplan turbine.
C. Francis turbine.
D. Propeller turbine.
Answer = Pelton turbine
343. The ratio of volume available at shaft of turbine and power supplied at the inlet of the turbine.
A. Mechanical efficiency.
B. Volumetric efficiency.
C. Hydraulic efficiency.
D. Overall efficiency.
Answer = Overall efficiency
344. A hydraulic coupling belongs to the category of________.
A. Energy absorbing machines.
B. Energy generating machines.
C. Power absorbing machines.
D. Energy transfer machines.
Answer = Energy transfer machines
345. The electric power which is obtained from hydraulic energy____________.
A. Thermal power.
B. Mechanical power.
C. Solar power.
D. Hydroelectric power.
Answer = Hydroelectric power
346. At present which is cheapest means of generating power_____________.
A. Thermal power.
B. Nuclear power.
C. Hydroelectric power.
D. Electric Power.
Answer = Hydroelectric power
347. Pipes of largest diameter which carry water from reservoir to the turbines is known as_____________.
A. Head stock.
B. Tail race.
C. Tail stock.
D. Pen stock.
Answer = Pen stock
348. Pen stocks are made up of_____________.
A. Steel.
B. Cast iron.
C. Mild steel.
D. Wrought iron.
Answer = Steel
349. ____________is an inward radial flow reaction turbine?.
A. Pelton turbine.
B. Kaplan turbine.
C. Francis turbine.
D. Propeller turbine.
Answer = Francis turbine
350. The important type of axial flow reaction turbines are ______________.
A. Propeller and Pelton turbines.
B. Kaplan and Francis turbines.
C. Propeller and Francis turbines.
D. Propeller and Kaplan turbines.
Answer = Propeller and Kaplan turbines
351. ______________ is a axial flow reaction turbines, if vanes are fixed to hub of turbine.
A. Propeller turbine.
B. Francis turbine.
C. Kaplan turbine.
D. Pelton turbine.
Answer = Propeller turbine
352. Francis and Kaplan turbines are known as _______.
A. Impulse turbine.
B. Reaction turbine.
C. Axial flow turbine.
D. Mixed flow turbine.
Answer = Reaction turbine
353. Specific speed of reaction turbine is between?.
A. 5 and 50.
B. 10 and 100.
C. 100 and 150.
D. 150 and 300.
Answer = 10 and 100
354. Impulse turbine is generally fitted at ______________.
A. At the level of tail race.
B. Above the tail race.
C. Below the tail race.
D. About 2.5mts above tail race to avoid cavitations..
Answer = Above the tail race
355. Hydraulic turbines are classified based on ____________.
A. Energy available at inlet of turbine.
B. Direction of flow through vanes.
C. Head at inlet of turbine.
D. Energy available, Direction of flow, Head at inlet..
Answer = Energy available, Direction of flow, Head at inlet.
356. Impulse turbine and reaction turbine are classified based on ?.
A. Type of energy at inlet.
B. Direction of flow through runner.
C. Head at inlet of turbine.
D. Specific speed of turbine.
Answer = Type of energy at inlet
357. Tangential flow, axial flow, radial flow turbines are classified based on?.
A. Type of energy at inlet.
B. Direction of flow through runner.
C. Head at inlet of turbine.
D. Specific speed of turbine.
Answer = Direction of flow through runner
358. High head, low head and medium head turbines are classified based on.
A. Type of energy at inlet.
B. Direction of flow through runner.
C. Head at inlet of turbine.
D. Specific speed of turbine.
Answer = Head at inlet of turbine
359. Low specific speed, high specific speed and medium specific speed are classified based on.
A. Type of energy at inlet.
B. Direction of flow through runner.
C. Head at inlet of turbine.
D. Specific speed of turbine.
Answer = Specific speed of turbine
360. If energy available at inlet of turbine is only kinetic energy then it is classified based on.
A. Type of energy at inlet.
B. Direction of flow through runner.
C. Head at inlet of turbine.
D. Specific speed of turbine.
Answer = Type of energy at inlet
361. If water flows in radial direction at inlet of runner and leaves axially at outlet then turbine is named as.
A. Tangential flow turbine.
B. Axial flow turbine.
C. Radial flow turbine.
D. Mixed flow turbine.
Answer = Mixed flow turbine
362. Pelton turbine is operated under_________.
A. Low head and high discharge.
B. High head and low discharge.
C. Medium head and high discharge.
D. Medium head and medium discharge.
Answer = High head and low discharge
363. Kaplan turbine is operated under __________.
A. Low head and high discharge.
B. High head and low discharge.
C. Medium head and high discharge.
D. Medium head and medium discharge.
Answer = Low head and high discharge
364. Medium specific speed of turbine implies _____________.
A. Pelton turbine.
B. Kaplan turbine.
C. Francis turbine.
D. Propeller turbine.
Answer = Francis turbine
365. High specific speed of turbine implies that it is___________.
A. Francis turbine.
B. Propeller turbine.
C. Pelton turbine.
D. Kaplan turbine.
Answer = Kaplan turbine
366. Velocity triangles are used to analyze ____________.
A. Flow of water along blades of turbine.
B. Measure discharge of flow.
C. Angle of deflection of jet.
D. Flow of water, measure of discharge, angle of deflection..
Answer = Flow of water, measure of discharge, angle of deflection.
367. In which of following turbine inlet and outlet blade velocities of vanes are equal?.
A. Francis turbine.
B. Kaplan turbine.
C. Pelton turbine.
D. Propeller turbine.
Answer = Pelton turbine
368. Tangential velocity of blade of Pelton wheel is proportional to ____________.
A. Speed of wheel.
B. Angular velocity of wheel.
C. Rpm of wheel.
D. Speed, angular velocity, RPM of the wheel.
Answer = Speed of wheel
369. The value of coefficient of velocity is _____________.
A. 0.98.
B. 0.65.
C. 0.85.
D. 0.33.
Answer = 0.98
370. In which of following turbine inlet whirl velocity and inlet jet velocity are equal in magnitude?.
A. Pelton turbine.
B. Propeller turbine.
C. Kaplan turbine.
D. Francis turbine.
Answer = Pelton turbine
371. In Pelton wheel, if outlet velocity angle of jet is “acute angled” then outlet whirl velocity of jet is ______________.
A. x- component of V(r2) – blade velocity.
B. x- component of V (r2) + blade velocity.
C. Blade velocity – x- component of V (r2).
D. Zero.
Answer = x- component of V(r2) – blade velocity
372. In Pelton wheel, if outlet velocity angle of jet is “obtuseangled” then outlet whirl velocity of jet is _____________.
A. x- component of V (r2) – blade velocity.
B. x- component of V (r2) + blade velocity.
C. Blade velocity – x- component of V (r2).
D. Zero.
Answer = Blade velocity – x- component of V (r2)
373. In Pelton wheel, if outlet velocity angle of jet is “right angled” then outlet whirl velocity of jet is __________.
A. x- component of V (r2) – blade velocity.
B. x- component of V (r2) + blade velocity.
C. Blade velocity – x- component of V (r2).
D. Zero.
Answer = Zero
374. In Pelton wheel, relative inlet velocity of jet with respect to velocity of vane is _____________.
A. Difference between inlet jet velocity and blade velocity.
B. Sum of inlet jet velocity and blade velocity.
C. Inlet jet velocity.
D. Blade velocity.
Answer = Difference between inlet jet velocity and blade velocity
375. In Pelton wheel if angle of deflection is not mentioned then we assume it as______________.
A. 150 degrees.
B. 200 degrees.
C. 165 degrees.
D. 185 degrees.
Answer = 165 degrees
376. The work done per unit weight of water jet striking runner blades of Pelton turbine is given by expression ______________.
A. [Vw1+Vw2] u/g.
B. Vw1*u/g.
C. [Vw1+Vw2]/g.
D. [Vw1+Vw2]u.
Answer = [Vw1+Vw2] u/g
377. In Pelton turbine the energy available at inlet of runner that is at outlet of nozzle is known as.
A. Shaft power.
B. Runner power.
C. Output power.
D. Water power.
Answer = Runner power
378. In Pelton turbines the expression for power delivered at inlet to runner is given by __________.
A. W*[Vw1+Vw2]u/g.
B. W*[Vw1-Vw2]u/g.
C. W*[Vw1+Vw2]u/g, W*[Vw1-Vw2]u/g.
D. [Vw1+Vw2]u/g.
Answer = W*[Vw1+Vw2]u/g, W*[Vw1-Vw2]u/g
379. In Pelton turbine runner power is more when compared with power available at exit of nozzle..
A. TRUE.
B. FALSE.
C. Nothing can be said.
D. None of the mentioned.
Answer = FALSE
380. Kinetic energy of jet at inlet of turbine is given as __________________.
A. 0.5(paV1)*V1.
B. 0.5(paV1)*V1*V1.
C. 0.5(aV1)*V1*V1.
D. 0.5(pV1)*V1*V1p= density of liquid, a= area of jet, V1= inlet jet velocity.
Answer = 0.5(paV1)*V1*V1
381. The force exerted by a jet of water in the direction of jet of jet on a stationary curved plates Fx is ____________ ; p=density, v= velocity of jet, k= blade angle.
A. pav*v.
B. pav.
C. pav*v(1+cos k).
D. pav*v(1+sin k).
Answer = pav*v(1+cos k)
382. The force exerted by a jet of water in the direction of jet of jet on moving curved plates is ___________ ; p=density, v= velocity of jet, k= blade angle, u= blade velocity.
A. pa(v-u)*(v-u).
B. pa(v-u).
C. pav*(v-u)(1+cos k).
D. pa(v-u)*(v-u)(1+sin k).
Answer = pav*(v-u)(1+cos k)
383. Calculate work done by jet per second on the runner where, discharge=0.7cubic meters/s, inlet and outlet whirl velocities be 23.77 and 2.94?.
A. 200Kw.
B. 150Kw.
C. 187Kw.
D. 250Kw.
Answer = 187Kw
384. The power supplied at inlet of turbine in S.I units is known as_____________.
A. Shaft power.
B. Runner power.
C. Water power.
D. Total power.
Answer = Water power
385. The expression for water power in Pelton wheel is ________________.
A. (P*g*Q*H) Kw.
B. (g*Q*H*a) Kw.
C. (g*Q) Kw.
D. (g*H) Kw.
Answer = (P*g*Q*H) Kw
386. The hydraulic efficiency of Pelton turbine will be maximum when blade velocity is equal to _______.
A. V/2.
B. V/3.
C. V/4.
D. V/5.
Answer = V/2
387. In Pelton turbine ___________ is defined as ratio between power delivered to runner and power supplied at inlet of turbine.
A. Mechanical efficiency.
B. Volumetric efficiency.
C. Hydraulic efficiency.
D. Overall efficiency.
Answer = Hydraulic efficiency
388. The maximum efficiency of Pelton turbine is _________.
A. 0.8.
B. 0.7.
C. 0.5.
D. 0.88.
Answer = 0.5
389. In Pelton turbine product of mechanical efficiency and hydraulic efficiency is known as _____________.
A. Mechanical efficiency.
B. Volumetric efficiency.
C. Hydraulic efficiency.
D. Overall efficiency.
Answer = Overall efficiency
390. Among the following which turbine has least efficiency?.
A. Pelton turbine.
B. Kaplan turbine.
C. Francis turbine.
D. Propeller turbine.
Answer = Pelton turbine
391. In Pelton ____________ is ratio of volume of water actually striking the runner and volume of water supplied to turbine?.
A. Mechanical efficiency.
B. Volumetric efficiency.
C. Hydraulic efficiency.
D. Overall efficiency.
Answer = Volumetric efficiency
392. In Pelton turbine the ratio of volume available at shaft of turbine and power supplied at the inlet of the turbine is _______.
A. Mechanical efficiency.
B. Volumetric efficiency.
C. Hydraulic efficiency.
D. Overall efficiency.
Answer = Overall efficiency
393. The expression for maximum hydraulic efficiency of Pelto turbine is given by ______________.
A. (1+cos k)/2 where k is outlet blade angle.
B. (2+cos k)/2 where k is outlet blade angle.
C. (3+cos k)/2 where k is outlet blade angle.
D. (4+cos k)/2 where k is outlet blade angle.
Answer = (1+cos k)/2 where k is outlet blade angle
394. In the expression for overall efficiency of turbine, which is p/ (k*g*q*h), where “k” is known as _______.
A. Specific density of liquid.
B. Density of liquid.
C. Specific gravity of liquid.
D. Volume of liquid.
Answer = Density of liquid
395. In Pelton turbine hydraulic efficiency is product of mechanical efficiency and overall efficiency..
A. TRUE.
B. FALSE.
C. Nothing can be said.
D. None of the mentioned.
Answer = FALSE
396. The expression for hydraulic efficiency is given by.
A. 2(V1-u)[1+cos k]u/V1*V1.
B. 2(V1+u)[1+cos k]u/V1*V1.
C. 2(V1-u)[1-cos k]u/V1*V1.
D. 2(V1+u)[1+cos k]u/V1*V1Where, V1=inlet jet velocity, u=blade velocity, k=outlet blade angle.
Answer = 2(V1-u)[1+cos k]u/V1*V1
397. In Pelton turbine inlet velocity of jet is 85.83m/s, inlet and outlet whirl velocities be 85.83 and 0.143 and blade velocity be 38.62 then its hydraulic efficiency is ___________.
A. 0.9014.
B. 0.8.
C. 0.7.
D. 0.85.
Answer = 0.9014
398. Design of Pelton wheel means the following data is to be determined..
A. Width of buckets.
B. Depth of buckets.
C. Number of buckets.
D. All of the mentioned.
Answer = All of the mentioned
399. The width of buckets of Pelton wheel is _________________.
A. 2 times diameter of jet.
B. 3 times diameter of jet.
C. 4 times diameter of jet.
D. 5 times diameter of jet.
Answer = 5 times diameter of jet
400. The depth of buckets of Pelton wheel ____________.
A. 1.2 times diameter of jet.
B. 1.3 times diameter of jet.
C. 1.4 times diameter of jet.
D. 1.5 times diameter of jet.
Answer = 1.2 times diameter of jet
401. The ratio of pitch diameter of Pelton wheel to diameter of jet is known as ___________.
A. Speed ratio.
B. Jet ratio.
C. Velocity ratio.
D. Co-efficient of velocity.
Answer = Jet ratio
402. Find the diameter of jet D, if jet ratio m and diameter of jet d are given as 10 and 125mm..
A. 1.25 meters.
B. 1.5 meters.
C. 2 meters.
D. 1.2 meters.
Answer = 1.25 meters
403. The number of buckets of Pelton wheel is 25 and diameter of runner is 1.5meters then calculate diameter of jet is ___________.
A. 80mm.
B. 85mm.
C. 90mm.
D. 82mm.
Answer = 85mm
404. In most of cases the value of jet ratio is _______________.
A. 10.0.
B. 11.0.
C. 12.0.
D. 13.0.
Answer = 12.0
405. Number of buckets on runner of Pelton wheel is given by expression? (D-diameter of runner and d- diameter of jet).
A. 15 + D/2d.
B. 15 + 3D/2d.
C. 15 + D/d.
D. 15 + 2D/d.
Answer = 15 + D/2d
406. ____________ is obtained by dividing total rate of flow through the turbine by rate of flow through single jet..
A. Number of jets.
B. Diameter of jets.
C. Velocity of jets.
D. Speed ratio.
Answer = Number of jets
407. If diameter of jet is 85mm and diameter of runner is 1.5 meter then calculate width of buckets..
A. 400mm.
B. 500mm.
C. 420mm.
D. 425mm.
Answer = 425mm
408. If diameter of jet is 85mm and diameter of runner is 1.5 meter then depth of buckets is ___________.
A. 100mm.
B. 105mm.
C. 106mm.
D. 102mm.
Answer = 102mm
409. If diameter of jet is 85mm and diameter of runner is 1.5 meter then calculate number of buckets on Pelton wheel approximately.
A. 20.0.
B. 22.0.
C. 23.0.
D. 25.0.
Answer = 25.0
410. The width of Pelton wheel should be 5 times the diameter of jet?.
A. TRUE.
B. FALSE.
C. Nothing can be said.
D. None of the mentioned.
Answer = TRUE
411. The ratio of diameter of jet to diameter of runner is _____________.
A. 31-Dec-1899.
B. 31-Dec-1899.
C. 31-Dec-1899.
D. 31-Dec-1899.
Answer = 31-Dec-1899
412. Radial flow reaction turbines are those turbines in which water flows ____________.
A. Radial direction.
B. Axial direction.
C. Tangential direction.
D. All of the mentioned.
Answer = Radial direction
413. Main parts of radial flow reaction turbines are ______________.
A. Casing.
B. Guide mechanism.
C. Draft tube.
D. All of the mentioned.
Answer = All of the mentioned
414. Discharge through radial flow reaction turbine is ______________ ; Where, P1= perimeter of runner at inlet, P2= perimeter of runner at outlet, b= thickness and Vf= flow velocity.
A. P1*b1*Vf1.
B. P2*b2*Vf2.
C. P1*b2*Vf2.
D. Both P1*b1*Vf1 & P2*b2*Vf2.
Answer = Both P1*b1*Vf1 & P2*b2*Vf2
415. Radial flow reaction turbines contain spiral casing which area ____________.
A. Remains constant.
B. Gradually decreases.
C. Gradually increases.
D. Suddenly decreases.
Answer = Gradually decreases
416. ____________ consists of stationary circular wheel all around the runner of turbine.
A. Casing.
B. Guide mechanism.
C. Runner.
D. Drafting.
Answer = Guide mechanism
417. The casing of radial flow reaction turbine is made of spiral shape, so that water may enter the runner__________.
A. Variable acceleration.
B. Constant acceleration.
C. Variable velocity.
D. Constant velocity.
Answer = Constant velocity
418. _____________ allow the water to strike the vanes fixed on runner without shock at inlet.
A. Casing.
B. Guide vanes.
C. Runner.
D. Draft tube.
Answer = Guide vanes
419. Runner blades are made up of _____________.
A. Cast steel.
B. Cast iron.
C. Wrought iron.
D. Steel.
Answer = Cast steel
420. The pressure at the exit of runner of reaction turbine is generally____________than atmospheric pressure.
A. Greater.
B. Lesser.
C. Constant.
D. Equal.
Answer = Lesser
421. ___________is a pipe of gradually increasing area used for discharging water from exit of the turbine to the tail race.
A. Casing.
B. Guide mechanism.
C. Draft tube.
D. Runner.
Answer = Draft tube
422. ____________and __________of radial flow reaction turbine are always full of water..
A. Casing and runner.
B. Casing and penstocks.
C. Runner and penstocks.
D. Runner and draft tube.
Answer = Casing and runner
423. ____________governs the flow of water entering the runner blades..
A. Casing.
B. Guide vanes.
C. Draft tube.
D. Runner.
Answer = Guide vanes
424. Spiral casing of reaction turbine will regulate the flow?.
A. TRUE.
B. FALSE.
C. Nothing can be said.
D. None of the mentioned.
Answer = FALSE
425. Inward radial flow reaction turbine is a turbine in which water flows across the blades of runner______________.
A. Radial direction.
B. Radially inward.
C. Radially outward.
D. Axial direction.
Answer = Radially inward
426. Which of following is inward radial flow reaction turbine?.
A. Pelton wheel.
B. Francis turbine.
C. Axial turbine.
D. Kaplan turbine.
Answer = Francis turbine
427. In Inward radial flow reaction turbine which is not required?.
A. Runner.
B. Air tight casing.
C. Guide vanes.
D. Breaking jet.
Answer = Breaking jet
428. The main difference between reaction turbine and inward radial flow reaction turbine is water flows___________.
A. Radial direction.
B. Radially inward.
C. Radially outward.
D. Axial direction.
Answer = Radially inward
429. In Inward radial flow reaction turbine the ratio of tangential wheel at inlet to given velocity of jet is known as _______.
A. Speed ratio.
B. Flow ratio.
C. Discharge.
D. Radial discharge.
Answer = Flow ratio
430. In Inward radial flow reaction turbine the ratio of tangential velocity at inlet to the given velocity ____________.
A. Speed ratio.
B. Flow ratio.
C. Discharge.
D. Radial discharge.
Answer = Speed ratio
431. The discharge through a reaction radial flow turbine is given by____________ ; Where, P1= perimeter of runner at inlet, P2= perimeter of runner at outlet, b= thickness and V f= flow velocity.
A. P1*b1*Vf1.
B. P2*b2*Vf2.
C. P1*b2*Vf2.
D. Both a & b.
Answer = Both a & b
432. In Inward radial flow reaction turbine if thickness is considered then discharge is _________; Where, P1= perimeter of runner at inlet, P2= perimeter of runner at outlet, b= width, Vf= flow velocity, n= number of blades and t= thickness of blades.
A. (P1-n*t)*b1*Vf1.
B. (P2-n*t)*b2*Vf2.
C. (P1-n*t)*b2*Vf2.
D. Both a & b.
Answer = Both a & b
433. In Inward radial flow reaction turbine if angle made by absolute velocity with its tangent is 90 degrees and component of whirl is zero at outlet is _____________.
A. Radial inlet discharge.
B. Radial outlet discharge.
C. Flow ratio.
D. Speed ratio.
Answer = Radial outlet discharge
434. In which of following turbine whirl component is zero?.
A. Reaction turbine.
B. Inward radial flow reaction turbine.
C. Axial flow turbine.
D. Impulse turbine.
Answer = Inward radial flow reaction turbine
435. Discharge in inward flow reaction turbine ____________.
A. Increases.
B. Decreases.
C. Remains constant.
D. Gradually decreases.
Answer = Decreases
436. Speed control of Outward flow reaction turbine is _________.
A. Easy.
B. Moderate.
C. Difficult.
D. Very difficult.
Answer = Moderate
437. Centrifugal head in inward flow reaction turbine __________.
A. Increases.
B. Decreases.
C. Remains constant.
D. Gradually decreases.
Answer = Decreases
438. Tendency of wheel to race is almost nil in ___________turbine.
A. Inward flow reaction turbine.
B. Outward flow reaction turbine.
C. Impulse turbine.
D. Axial flow turbine.
Answer = Inward flow reaction turbine
439. Inward flow reaction turbine is used in practical applications __________.
A. TRUE.
B. FALSE.
C. Nothing can be said.
D. None of the mentioned.
Answer = TRUE
440. The formation of vapour cavities is called _____.
A. Static pressure drop.
B. Cavitation.
C. Isentropic expansion.
D. Emulsion.
Answer = Cavitation
441. What is the degree of reaction denoted as?.
A. D.
B. R.
C. r.
D. d.
Answer = R
442. Voids are created due to______.
A. Reaction ratio.
B. Pressure ratio.
C. Liquid free layers.
D. Volumetric layers.
Answer = Liquid free layers
443. Cavitation usually occurs due to the changes in ________.
A. Pressure.
B. Temperature.
C. Volume.
D. Heat.
Answer = Pressure
444. Degree of reactions are most commonly used in________.
A. Turbomachinery.
B. Pressure drag.
C. Aerodynamics.
D. Automobiles.
Answer = Turbomachinery
445. At high pressure, the voids can generate ______.
A. Drag force.
B. Mass density.
C. Shock waves.
D. Flow speed.
Answer = Shock waves
446. Voids that implode near metal surface develops a_______.
A. Drag force.
B. Cyclic stress.
C. Shock waves.
D. Flow speed.
Answer = Cyclic stress
447. In case of gas turbines and compressors, degree of reaction is ________.
A. Static pressure drop in rotor/ static pressure drop in stage.
B. Static pressure drop in stage/ static pressure drop in rotor.
C. Isentropic enthalpy drop in rotor/ isentropic enthalpy drop in stage.
D. Static temperature drop in stage/ static temperature drop in rotor.
Answer = Isentropic enthalpy drop in rotor/ isentropic enthalpy drop in stage
448. Non- inertial cavitation is the one in which a bubble of fluid is forced to oscillate..
A. TRUE.
B. FALSE.
C. Nothing can be said.
D. None of the mentioned.
Answer = TRUE
449. The velocities of the blade angles can be found out using________.
A. Mach number.
B. Froude’s number.
C. Velocity triangles.
D. Reynolds number.
Answer = Velocity triangles
450. Which among the following velocities cannot be found using the velocity triangle?.
A. Tangential.
B. Whirl.
C. Relative.
D. Parabolic.
Answer = Parabolic
451. Hydrodynamic cavitation is due to the process of _________.
A. Vaporisation.
B. Sedimentation.
C. Filtration.
D. Excavation.
Answer = Vaporisation
452. The process of bubble generation leads to __________.
A. High temperatures.
B. High pressures.
C. High energy densities.
D. High volumetric ratio.
Answer = High energy densities
453. Super cavitation is the use of cavitation effect to create a bubble of steam inside a liquid..
A. TRUE.
B. FALSE.
C. Nothing can be said.
D. None of the mentioned.
Answer = TRUE
454. Degree of reaction turbine is the ratio of?.
A. Pressure energy to total energy.
B. Kinetic energy to total energy.
C. Potential energy to total energy.
D. Kinetic energy to potential energy.
Answer = Pressure energy to total energy
455. Which of these options are best suited for the total energy change inside the runner per unit weight?.
A. Degree of action.
B. Degree of reaction.
C. Turbulence.
D. Efficiency of turbine.
Answer = Degree of reaction
456. Which of these ratios are termed to be hydraulic efficiency?.
A. Water power to delivered power.
B. Delivered power to input power.
C. Power lost to power delivered.
D. Runner power to water power.
Answer = Runner power to water power
457. When a container containing a liquid is rotated, then due to centrifugal action, then which of these energies are changed?.
A. Kinetic energy.
B. Pressure energy.
C. Potential energy.
D. Energy due to viscous force.
Answer = Pressure energy
458. For an actual reaction turbine, what should be the angle beta, such that the loss of kinetic energy at the outlet is to be minimum?.
A. 90.0.
B. 45.0.
C. 60.0.
D. 30.0.
Answer = 90.0
459. Discharge through a reaction flow reaction turbine is given by, Q = ______.
A. Pi*d*b*Vf1.
B. Pi*d*d*b*Vf1.
C. Pi*d*b*b*Vf2.
D. Pi*b*b*Vf1.
Answer = Pi*d*b*Vf1
460. When the thicknesses of vanes are to be considered in the discharge of a turbine, what will be the area under consideration?.
A. Pi*d – n*t.
B. Pi*d – n*n*t.
C. Pi*d – t*t.
D. Pi*d *d– n*t.
Answer = Pi*d – n*t
461. The speed ratio is defined as u/(2gH)^1/2.
A. TRUE.
B. FALSE.
C. Nothing can be said.
D. None of the mentioned.
Answer = TRUE
462. Flow ratio is defined as Vf1/(2gH)^1/2.
A. FALSE.
B. TRUE.
C. FALSE.
D. Nothing can be said.
Answer = FALSE
463. The water from penstocks enters the _____ which is spiral in shape which the area of cross section of casing goes on decreasing gradually.
A. guide wheel.
B. draft tube.
C. casing.
D. runner.
Answer = casing
464. If the water flows from inwards to outwards, the turbine is known as _____________.
A. Tangential flow turbine.
B. Turbulent low inward flow.
C. Inward flow turbine.
D. Outward flow turbine.
Answer = Outward flow turbine
465. In general, reaction turbines consist of which types of energies?.
A. kinetic energy and potential energy.
B. potential energy and pressure energy.
C. kinetic energy and pressure energy.
D. gravitational energy and potential energy.
Answer = kinetic energy and pressure energy
466. ___________ is a circular wheel on which a series of smooth, radial curved vanes are fixed..
A. Guide wheel.
B. Runner.
C. Casing.
D. Draft tube.
Answer = Runner
467. In outward radial flow reaction turbines, tangential velocity at inlet is less than that of the outlet..
A. FALSE.
B. TRUE.
C. FALSE.
D. Nothing can be said.
Answer = TRUE
468. In impulse turbines with moving blades, there is no _________ in blades of the turbine..
A. Pressure change.
B. Same pressure.
C. Volumetric change.
D. Pressure independent.
Answer = Pressure change
469. In impulse turbines with stationary blades, there is_________ in blades of the turbine..
A. Pressure change.
B. Same pressure.
C. Volumetric change.
D. Pressure independent.
Answer = Pressure change
470. In an outward flow reaction turbine the discharge _______.
A. Increases.
B. Decreases.
C. Same.
D. Independent.
Answer = Increases
471. Before reaching the turbine, the acceleration of the fluid takes place through the__________.
A. Vane angle.
B. Nozzle.
C. Pump.
D. Pipe.
Answer = Nozzle
472. The Pelton wheel extracts energy from________.
A. Vane angle.
B. Moving fluid.
C. Increase in temperature.
D. Heat rejection.
Answer = Moving fluid
473. Pelton wheel is a Reaction type water turbine..
A. TRUE.
B. FALSE.
C. Nothing can be said.
D. None of the mentioned.
Answer = FALSE
474. The outward radial flow reaction turbine is a turbine in which direction of water flow is ___________.
A. Radial direction.
B. Radially inward.
C. Radially outward.
D. Axial direction.
Answer = Radially outward
475. Outward flow reaction turbine is used in practical applications.
A. TRUE.
B. FALSE.
C. Nothing can be said.
D. None of the mentioned.
Answer = FALSE
476. The energy available at inlet for outward reaction flow turbine is ____________.
A. Potential.
B. Kinetic energy.
C. Pressure energy.
D. Pressure energy and Kinetic energy.
Answer = Pressure energy and Kinetic energy
477. Centrifugal head in Outward flow reaction turbine _____________.
A. Increases.
B. Decreases.
C. Remains constant.
D. Gradually decreases.
Answer = Increases
478. Discharge in outward flow reaction turbine ____________.
A. Increases.
B. Decreases.
C. Remains constant.
D. Gradually decreases.
Answer = Increases
479. Speed control of Outward flow reaction turbine is _____________.
A. Easy.
B. Moderate.
C. Difficult.
D. Very difficult.
Answer = Very difficult
480. Tendency of wheel to race is predominant in____________turbine.
A. Inward flow reaction turbine.
B. Outward flow reaction turbine.
C. Impulse turbine.
D. Axial flow turbine.
Answer = Outward flow reaction turbine
481. Outward flow reaction turbine will quite suitable for_____________.
A. High head.
B. Medium head.
C. Low head.
D. Static head.
Answer = Medium head
482. In outward flow reaction turbine tangential velocity at inlet is always__________than outlet velocity..
A. Equal.
B. Less.
C. More.
D. Constant.
Answer = Less
483. In outward radial flow reaction turbine if angle made by absolute velocity with its tangent is 90 degrees and component of whirl is zero at inlet is _______________.
A. Radial inlet discharge.
B. Radial outlet discharge.
C. Flow ratio.
D. Speed ratio.
Answer = Radial inlet discharge
484. In outward radial flow reaction turbine if thickness is considered then discharge is ____________ ; Where, P1= perimeter of runner at inlet, P2= perimeter of runner at outlet, b= width, Vf= flow velocity, n= number of blades and t= thickness of blades.
A. (P1-n*t)*b1*Vf1.
B. (P2-n*t)*b2*Vf2.
C. (P1-n*t)*b2*Vf2.
D. Both (P1-n*t)*b1*Vf1 & (P2-n*t)*b2*Vf2.
Answer = Both (P1-n*t)*b1*Vf1 & (P2-n*t)*b2*Vf2
485. The main difference between reaction turbine and outward radial flow reaction turbine is water flows __________.
A. Radial direction.
B. Radially inward.
C. Radially outward.
D. Axial direction.
Answer = Radially inward
486. In outward radial flow reaction turbine the ratio of tangential wheel at inlet to given velocity of jet is known as ___________.
A. Speed ratio.
B. Flow ratio.
C. Discharge.
D. Radial discharge.
Answer = Flow ratio
487. Conical diffuser draft tube is also called_______.
A. Straight divergent tube.
B. Simple elbow tube.
C. Thermal tube.
D. Elbow tube with varying cross section.
Answer = Straight divergent tube
488. Steam turbine converts energy into________.
A. Electrical work.
B. Mechanical work.
C. Chemical work.
D. Thermal work.
Answer = Mechanical work
489. Most common application of steam turbine is _______.
A. Motor.
B. Generator.
C. Pump.
D. Filter.
Answer = Generator
490. Conical diffuser draft tube consists of conical diffuser with angles of______.
A. 10 degrees.
B. 20 degrees.
C. 30 degrees.
D. 40 degrees.
Answer = 10 degrees
491. What is the purpose of a conical diffuser?.
A. To prevent flow separation.
B. To avoid Pressure drag.
C. To prevent rejection of heat.
D. To increase efficiency.
Answer = To prevent flow separation
492. What is the efficiency of conical diffuser draft tube?.
A. 30.0.
B. 50.0.
C. 70.0.
D. 90.0.
Answer = 90.0
493. The simple elbow draft tube is placed close to the_______.
A. Head race.
B. Tail race.
C. Tank.
D. Nozzle.
Answer = Tail race
494. Turbine that consists of moving nozzles and with fixed nozzles is called as__________.
A. Impulse turbine.
B. Curtis turbine.
C. Rateau turbine.
D. Reaction turbine.
Answer = Reaction turbine
495. An example of reaction turbine is________.
A. Parsons turbine.
B. Curtis turbine.
C. Rateau turbine.
D. Pelton wheel.
Answer = Parsons turbine
496. When we arrange turbine blades in multiple stages it is called ________.
A. Pressure change.
B. Vane deviation.
C. Compounding.
D. Pressure ratio.
Answer = Compounding
497. Compounding is needed to ___________.
A. Increase Pressure.
B. Decrease temperature.
C. Change volume.
D. Increase efficiency.
Answer = Increase efficiency
498. Which among the following is not a type of compounding?.
A. Pressure.
B. Temperature.
C. Pressure velocity.
D. Velocity.
Answer = Temperature
499. Newtons second law describes the transfer of energy through impulse turbines..
A. TRUE.
B. FALSE.
C. Nothing can be said.
D. None of the mentioned.
Answer = TRUE
500. Inner radial flow extracts energy from _____.
A. Turbine blades.
B. Moving fluid.
C. Pressure change.
D. Temperature increase.
Answer = Moving fluid
501. Reaction turbines develop torque by reacting to the gas or fluids pressure or mass..
A. TRUE.
B. FALSE.
C. Nothing can be said.
D. None of the mentioned.
Answer = TRUE
502. What is the water flow direction in the runner in a Francis turbine?.
A. Axial and then tangential.
B. Tangential and then axial.
C. Radial and then axial.
D. Axial and then radial.
Answer = Radial and then axial
503. Which of the following is true in case of flow of water before it enters the runner of a Francis Turbine?.
A. Available head is entirely converted to velocity head.
B. Available head is entire converted to pressure head.
C. Available head is neither converted to pressure head nor velocity head.
D. Available head is partly converted to pressure head and partly to velocity head.
Answer = Available head is partly converted to pressure head and partly to velocity head
504. Why does the cross sectional area of the Spiral casing gradually decrease along the circumference of the Francis turbine from the entrance to the tip?.
A. To ensure constant velocity of water during runner entry.
B. To prevent loss of efficiency of the turbine due to impulsive forces caused by extra area.
C. To prevent leakage from the turbine.
D. To reduce material costs in order to make the turbine more economical.
Answer = To ensure constant velocity of water during runner entry
505. Which of the following profiles are used for guide vanes to ensure smooth flow without separation?.
A. Rectangular.
B. Bent Rectangular.
C. Elliptical.
D. Aerofoil.
Answer = Aerofoil
506. In which of the following type of runners the velocity of whirl at inlet is greater than the blade velocity?.
A. Such a case is practically impossible.
B. Slow Runner.
C. Medium Runner.
D. Fast Runner.
Answer = Slow Runner
507. Which of the following runner types will have the highest vane angle at inlet (β1 value)?.
A. Slow Runner.
B. Medium Runner.
C. Fast Runner.
D. Vane angle is defined only for Kaplan Turbines and not Francis turbines.
Answer = Fast Runner
508. In case of a Medium runner, tan (α1) CANNOT be given by (α1 = Guide vane angle at inlet)?.
A. Vf1 / Vw1.
B. Vr1 / Vw1.
C. Vr1 / u1.
D. Vw1 / u1.
Answer = Vw1 / u1
509. In the velocity diagrams for Francis turbine, which of the following velocity directions is along the blade curvature?.
A. Vr1.
B. Vw1.
C. V1.
D. u1.
Answer = Vr1
510. Francis turbine is typically used for which of the following values of available heads?.
A. 300 m.
B. 100 m.
C. 30 m.
D. 5 m.
Answer = 100 m
511. Water flow velocity is given 10 m/s. The runner diameter is 3 m and the width of the wheel is 25 cm. Find the mass of water (kg) flowing across the runner per second..
A. 7500π.
B. 50π.
C. 300π.
D. RPM of the turbine needs to be given.
Answer = 7500π
512. Work done per second by a Francis turbine can be given by ρAVf (Vw1u1 + Vw2u2)..
A. TRUE.
B. FALSE.
C. Nothing can be said.
D. None of the mentioned.
Answer = FALSE
513. Which of the following terms is considered to be zero while deriving the equation for work done per second for Francis Turbine?.
A. Vr1.
B. Vw2.
C. Vf2.
D. Vr2.
Answer = Vw2
514. Power developed by Francis turbine are calculated for a certain set of conditions. Now, the inlet whirl velocity is doubled, the blade velocity at inlet is doubled and the flow velocity is quartered. The power developed:.
A. Is 4 times the original value.
B. Is 2 times the original value.
C. Is ½ times the original value.
D. Is same as the original value.
Answer = Is same as the original value
515. Volume flow rate of water in a Francis turbine runner is 25 m3/s. The flow velocity, whirl velocity and blade velocity are 11 m/s, 10 m/s and 5 m/s respectively, all values given at runner inlet. Find the power developed by the turbine..
A. 25 kW.
B. 1.25 MW.
C. 1.25 kW.
D. 25 MW.
Answer = 1.25 MW
516. The flow rate of the water flow in a Francis turbine is increased by 50% keeping all the other parameters same. The work done by the turbine changes by?.
A. 50% increase.
B. 25% increase.
C. 100% increase.
D. 150% increase.
Answer = 50% increase
517. A student performs an experiment with a Francis turbine. He accidently set the RPM of Francis turbine to 1400 rpm instead of 700 rpm. He reported the power to be 1 MW. His teacher asks him to perform the same experiment using the correct RPM. The student performs the same experiment again, but this time the erroneously doubled the flow velocity. What does the student report the power to be?.
A. 0.5 MW.
B. 0.25 MW.
C. 2 MW.
D. 1 MW.
Answer = 1 MW
518. Velocity of whirl at the runner inlet is given to be 10 m/s and blade velocity to be 5 m/s. The volume flow rate of water in Francis turbine is given to be 25 m3/s. Find the power generated by the turbine?.
A. 1700 HP.
B. 800 HP.
C. 3400 HP.
D. 1000 HP.
Answer = 1700 HP
519. The available head of a Francis Turbine is 100 m. Velocity of the flow at the runner inlet is 15 m/s. Find the flow ratio..
A. 0.33.
B. 0.45.
C. 0.67.
D. 0.89.
Answer = 0.33
520. How does the flow ratio (ψ) of a Francis turbine vary with available head (H)?.
A. ψ α H.
B. ψ α 1/H.
C. ψ α sqrt (H).
D. ψ α 1/(sqrt (H)).
Answer = ψ α 1/(sqrt (H))
521. What is the typical value for flow ratio in a Francis turbine?.
A. 0.05 – 0.1.
B. 0.15 – 0.30.
C. 0.35 – 0.45.
D. 0.50 – 0.60.
Answer = 0.15 – 0.30
522. The available head of a Francis Turbine is 120 m. The blade velocity is given 35 m/s. Find the speed ratio of the turbine..
A. 0.56.
B. 0.61.
C. 0.71.
D. 0.81.
Answer = 0.71
523. The speed ratio (φ) varies directly with which of the following parameters?.
A. Vw1.
B. V1.
C. N (RPM).
D. H (Available head).
Answer = N (RPM)
524. The typical value range of speed ratio for a Francis turbine is:.
A. 0.3 – 0.6.
B. 0.5 – 0.6.
C. 0.1 – 0.4.
D. 0.6 – 0.9.
Answer = 0.6 – 0.9
525. Which of the following efficiencies for Francis Turbine is described as the ratio between the power produced by runner to the power supplied by water at the inlet?.
A. Hydraulic efficiency.
B. Volumetric efficiency.
C. Mechanical efficiency.
D. Overall efficiency.
Answer = Hydraulic efficiency
526. Which of the following efficiencies for Francis Turbine is described as the ratio between total quantity of water over runner blades to total quantity of water supplied to turbine?.
A. Hydraulic efficiency.
B. Volumetric efficiency.
C. Mechanical efficiency.
D. Overall efficiency.
Answer = Volumetric efficiency
527. Which of the following efficiencies for Francis Turbine is defined as the ratio between the power available at the shaft of the turbine to the power produced by the runner?.
A. Hydraulic efficiency.
B. Volumetric efficiency.
C. Mechanical efficiency.
D. Overall efficiency.
Answer = Mechanical efficiency
528. Which of the following efficiencies for Francis Turbine is defined as the ratio between the power available at the shaft to the power supplied by water at the inlet?.
A. Hydraulic efficiency.
B. Volumetric efficiency.
C. Mechanical efficiency.
D. Overall efficiency.
Answer = Overall efficiency
529. The whirl velocity at inlet of Francis turbine is given to be 20 m/s. The blade velocity is given as 35 m/s. What is the hydraulic efficiency for a head of 100 m?.
A. 0.8.
B. 0.9.
C. 0.7.
D. 0.98.
Answer = 0.7
530. The desired hydraulic efficiency of a turbine is 80% at a whirl velocity of 20 m/s and a head of 100 m. What should be the blade velocity of the turbine at inlet in m/s?.
A. 40.0.
B. 60.0.
C. 80.0.
D. 25.0.
Answer = 40.0
531. The input water power of the Francis turbine is 1.25 times the runner power. What would be the hydraulic efficiency of the turbine (in %)?.
A. 60.0.
B. 70.0.
C. 80.0.
D. 90.0.
Answer = 80.0
532. The volume flow rate into a Francis turbine is Q m3/s. 0.25Q m3/s volume of water do not flow over the runner blades. What is the mechanical efficiency of the turbine (in %)?.
A. 65.0.
B. 75.0.
C. 80.0.
D. Mechanical efficiency cannot be found out from the given information.
Answer = Mechanical efficiency cannot be found out from the given information
533. The volumetric efficiency of a Francis turbine is given to be 90%. If the volume flow rate through the turbine is 25 m3/s. What is the flow rate of water over the runner blades (in m3/s)?.
A. 20.0.
B. 25.0.
C. 22.5.
D. 21.5.
Answer = 22.5
534. The volumetric efficiency of a given turbine is 80%. If volume flow rate of water in given to be 30 m3/s, find the volume of water (m3) NOT flowing over the runner blades per second?.
A. 5.0.
B. 6.0.
C. 10.0.
D. 12.0.
Answer = 6.0
535. The power available at the shaft of a Francis turbine is 1 MW. The volume flow rate of water in 25 m3/s, whirl velocity at inlet is 10 m/s and blade velocity is 5 m/s. Find the mechanical efficiency (in %)?.
A. 65.0.
B. 75.0.
C. 80.0.
D. 90.0.
Answer = 80.0
536. The whirl velocity at inlet is 15 m/s and blade velocity is 10 m/s. The volume flow rate of water in 20 m3/s. Find the power output available at the shaft if the mechanical efficiency is 95% (in MW)?.
A. 2.85.
B. 3.075.
C. 6.55.
D. 0.285.
Answer = 2.85
537. The power output of the shaft is 5 MW. The volume flow rate of water in 10 m3/s at an available head of 60 m. Find the overall efficiency of the turbine in % (g = 10 m/s2)?.
A. 80.0.
B. 82.5.
C. 83.3.
D. 85.0.
Answer = 83.3
538. The volume flow rate of water in 10 m3/s at an available head of 60 m (g = 10 m/s3). Find the shaft power (in MW) if the overall efficiency of the turbine is 90%..
A. 54.0.
B. 5.4.
C. 540.0.
D. 0.54.
Answer = 5.4
539. The hydraulic efficiency of a Francis turbine is 90%, the mechanical efficiency is 95% and the volumetric efficiency is assumed to be 100%. Fine the overall efficiency (in %)?.
A. 80.0.
B. 85.5.
C. 87.5.
D. 83.3.
Answer = 85.5
540. In a Kaplan turbine, what is the direction of water flow?.
A. Axial and then axial.
B. Radial and then axial.
C. Tangential and then axial.
D. Tangential and then radial.
Answer = Axial and then axial
541. For which of the following values of available heads may Kaplan turbine be used?.
A. 250 m.
B. 100 m.
C. 80 m.
D. 50 m.
Answer = 50 m
542. In this type of low head turbine, the guide vanes are fixed to the hub of the turbine and are not adjustable. What is this type of turbine called?.
A. Francis turbine.
B. Kaplan Turbine.
C. Propeller Turbine.
D. Pelton turbine.
Answer = Francis turbine
543. The velocity of flow through a Kaplan turbine is 10 m/s. The outer diameter of the runner is 4 m and the hub diameter is 2 m. Find the volume flow rate of the turbine in m3/s?.
A. 95.0.
B. 75.0.
C. 85.0.
D. 105.0.
Answer = 95.0
544. The velocity of the flow at the inlet of Kaplan turbine is V. In an experimental setup, what could be the possible value of the velocity of the flow at the outlet of Kaplan turbine?.
A. V.
B. 0.8V.
C. 1.2V.
D. 2V.
Answer = 0.8V
545. Which of the following turbines will have the lowest number of blades in it?.
A. Pelton turbine.
B. Steam turbine.
C. Francis turbine.
D. Kaplan turbine.
Answer = Kaplan turbine
546. The velocity of the flow through the Kaplan turbine is 25 m/s. The available head of the turbine is 60 m. Find the flow ratio of the turbine (take g = 10 m/s2)..
A. 0.65.
B. 0.72.
C. 0.69.
D. 0.75.
Answer = 0.72
547. A Kaplan turbine requires a speed ratio of 2. The available head of the turbine is 5 m. What should be the blade velocity of the turbine such that a speed ratio of 2 is maintained (take g = 10 m/s2)?.
A. 75.75 m/s.
B. 63.25 m/s.
C. 23.35 m/s.
D. 50.00 m/s.
Answer = 63.25 m/s
548. The flow ratio of a Kaplan turbine is given as 0.7. The available head is 30 m. The outer diameter of the runner is 3.5 m and the hub diameter is 2 m. Find the volume of water flowing through the turbine per second (m3/s)?.
A. 90.0.
B. 111.0.
C. 125.0.
D. 168.0.
Answer = 111.0
549. In which of the following type of runners in a Kaplan turbine the velocity of whirl at inlet is smaller than the blade velocity?.
A. Such a case is practically impossible.
B. Slow Runner.
C. Medium Runner.
D. Fast Runner.
Answer = Fast Runner
550. In the outlet velocity triangle of a Kaplan turbine, β2 = 30o. Vf2 = 5 m/s. What is the relative velocity of the flow at outlet?.
A. 10 m/s.
B. 5.77 m/s.
C. 8.66 m/s.
D. 2.88 m/s.
Answer = 10 m/s
551. In the inlet velocity triangle of a Kaplan turbine, α1 = 45o. The velocity of flow at inlet = 10 m/s. Find the whirl velocity of water at the inlet of Kaplan turbine?.
A. 5 m/s.
B. 10 m/s.
C. 12.5 m/s.
D. 15 m/s.
Answer = 10 m/s
552. The whirl velocity of water at the inlet of the Kaplan turbine is 15 m/s. The velocity of water at inlet of the turbine is 20 m/s. Find the guide vane angle at inlet (In degrees)..
A. 53.13.
B. 36.86.
C. 45.0.
D. 41.41.
Answer = 41.41
553. The relative velocity of water at the inlet of the Kaplan turbine is 7 m/s. β1 = 75o. The whirl velocity of the water at inlet is 10 m/s. Find the blade velocity of the turbine?.
A. 26.124 m/s.
B. 40 m/s.
C. 36.124 m/s.
D. 60 m/s.
Answer = 36.124 m/s
554. Kaplan turbine works on________.
A. Electrical energy.
B. Hydro energy.
C. Thermal energy.
D. Chemical energy.
Answer = Thermal energy
555. Kaplan turbine is an ______ reaction turbine.
A. Inward flow.
B. Outward flow.
C. Radial.
D. Axial.
Answer = Inward flow
556. The Kaplan Turbine is an evolution of ________.
A. Francis turbine.
B. Pelton wheel.
C. Parsons turbine.
D. Curtis turbine.
Answer = Francis turbine
557. What is the dimension of thermal efficiency of a Kaplan turbine?.
A. kg.
B. m.
C. kg/m.
D. Dimensionless.
Answer = Dimensionless
558. A Kaplan turbine is used in ________.
A. Turbomachinery.
B. Pressure drag.
C. Aerodynamics.
D. Automobiles.
Answer = Turbomachinery
559. The head of the Kaplan ranges from ______.
A. 100 to 200 m.
B. 250 to 300 m.
C. 10 to 70 m.
D. 0 m.
Answer = 10 to 70 m
560. Nozzles in the Kaplan turbine move due to impact of ________.
A. Water.
B. Steam.
C. Blade.
D. Another nozzle.
Answer = Steam
561. The power output of Kaplan turbine ranges from__________.
A. 5 to 200 MW.
B. 1000 to 2000 MW.
C. 2000 to 3000 MW.
D. 5000 and above.
Answer = 5 to 200 MW
562. Kaplan turbines rotates at a ________ rate.
A. Increasing.
B. Decreasing.
C. Constant.
D. Increasing and then decreasing.
Answer = Constant
563. What type of turbine is Kaplan?.
A. Impulse.
B. Reaction.
C. Energy.
D. Hydro.
Answer = Reaction
564. Kaplan turbine is needed to improve ________.
A. Increase Pressure.
B. Decrease temperature.
C. Change volume.
D. Increase efficiency.
Answer = Increase efficiency
565. Kaplan turbine is an ________ type turbine.
A. Pressure.
B. Inward flow.
C. Outward flow.
D. Velocity.
Answer = Inward flow
566. The turbine does not have to be at the lowest point of water flow as long as the water in the draft tube is full..
A. TRUE.
B. FALSE.
C. Nothing can be said.
D. None of the mentioned.
Answer = TRUE
567. The outlet of the Kaplan turbine is through _______.
A. Vane Blades.
B. Moving pipeline.
C. Draft tube.
D. Pump.
Answer = Draft tube
568. Kaplan turbine is most commonly used in propeller turbines..
A. TRUE.
B. FALSE.
C. Nothing can be said.
D. None of the mentioned.
Answer = TRUE
569. For a Kaplan turbine, the whirl velocity at inlet of the turbine is given to be 18 m/s. The blade velocity is given as 25 m/s. What is the hydraulic efficiency for a head of 50 m. Take g = 10 m/s2?.
A. 0.8.
B. 0.9.
C. 0.7.
D. 0.98.
Answer = 0.9
570. Which of the following efficiencies for Kaplan Turbine is described as the ratio between the power produced by runner to the power supplied by water at the inlet?.
A. Hydraulic efficiency.
B. Volumetric efficiency.
C. Mechanical efficiency.
D. Overall efficiency.
Answer = Hydraulic efficiency
571. The desired hydraulic efficiency of a Kaplan turbine is 98% at a whirl velocity of 20 m/s and a head of 60 m. What should be the blade velocity of the turbine at inlet in m/s? Take g = 10 m/s2..
A. 40.0.
B. 60.0.
C. 80.0.
D. 30.0.
Answer = 30.0
572. It is given that the input water power of the Kaplan turbine is 1.10 times the runner power. What would be the hydraulic efficiency of the turbine (in %)?.
A. 60.61.
B. 70.71.
C. 80.81.
D. 90.91.
Answer = 90.91
573. Which of the following efficiencies for Kaplan Turbine is described as the ratio between total quantity of water over runner blades to total quantity of water supplied to turbine?.
A. Hydraulic efficiency.
B. Volumetric efficiency.
C. Mechanical efficiency.
D. Overall efficiency.
Answer = Volumetric efficiency
574. The volume flow rate into a Kaplan turbine is Q m3/s. 0.10Q m3/s volume of water do not flow over the runner blades. What further information is required to find the volumetric efficiency (numerical value) of the Kaplan turbine?.
A. The numerical value of Q.
B. The available head of the turbine.
C. The RPM or the blade velocity of the turbine.
D. No further information is required.
Answer = No further information is required
575. A student reports the volumetric efficiency of a Kaplan turbine to be 95%. If he measures the volume flow rate through the turbine is 40 m3/s. What is the flow rate of water over the runner blades (in m3/s)?.
A. 38.0.
B. 40.0.
C. 42.11.
D. 45.0.
Answer = 38.0
576. In a Kaplan turbine experiment, the volumetric efficiency of a given turbine is 91%. If volume flow rate of water in given to be 35 m3/s, find the volume of water (m3) NOT flowing over the runner blades per second?.
A. 4.05.
B. 3.15.
C. 3.3.
D. 2.55.
Answer = 3.15
577. Which of the following efficiencies for Kaplan Turbine is defined as the ratio between the power available at the shaft of the turbine to the power produced by the runner?.
A. Hydraulic efficiency.
B. Volumetric efficiency.
C. Mechanical efficiency.
D. Overall efficiency.
Answer = Mechanical efficiency
578. The power available at the shaft of a Kaplan turbine is 0.75 MW. The volume flow rate of water in 15 m3/s, whirl velocity at inlet is 12 m/s and blade velocity is 5 m/s. Find the mechanical efficiency (in %)?.
A. 66.66.
B. 75.0.
C. 83.33.
D. 91.33.
Answer = 83.33
579. The whirl velocity at inlet of a Kaplan turbine is 7.5 m/s and blade velocity is 5 m/s. The volume flow rate of water in 20 m3/s. Find the power output available at the shaft if the mechanical efficiency is 93% (in MW)?.
A. 0.831.
B. 0.697.
C. 1.362.
D. 0.298.
Answer = 0.697
580. In a Kaplan Turbine experimental setup, the power output of the shaft is 4.325 MW. The volume flow rate of water in 15 m3/s at an available head of 50 m. Find the overall efficiency of the turbine in % (g = 10 m/s2)?.
A. 57.66.
B. 83.63.
C. 81.33.
D. 79.95.
Answer = 57.66
581. The hydraulic efficiency of a Kaplan turbine is 95%, the mechanical efficiency is 93% and the volumetric efficiency is assumed to be 100%. Fine the overall efficiency (in %)?.
A. 80.05.
B. 93.15.
C. 87.55.
D. 88.35.
Answer = 88.35
582. Which of the following efficiencies for Kaplan Turbine is defined as the ratio between the power available at the shaft to the power supplied by water at the inlet?.
A. Hydraulic efficiency.
B. Volumetric efficiency.
C. Mechanical efficiency.
D. Overall efficiency.
Answer = Overall efficiency
583. In Kaplan turbine apparatus, the volume flow rate of water in 15 m3/s at an available head of 55 m (g = 10 m/s2). Find the shaft power (in MW) if the overall efficiency of the turbine is 95%..
A. 78.3.
B. 7.83.
C. 783.0.
D. 0.783.
Answer = 7.83
584. Draft tube is also called_______.
A. Straight divergent tube.
B. Simple elbow tube.
C. Thermal tube.
D. Elbow tube with varying cross section.
Answer = Straight divergent tube
585. A draft tube helps in converting kinetic energy into________.
A. Electrical work.
B. Mechanical work.
C. Chemical work.
D. Thermal work.
Answer = Mechanical work
586. Most common application of the draft tube is ______.
A. Rotor.
B. Motor.
C. Pump.
D. Filter.
Answer = Pump
587. Draft tube consists of conical diffuser with angles of______.
A. 10 deg.
B. 20 deg.
C. 30 deg.
D. 40 deg.
Answer = 10 deg
588. What is the purpose of a Draft tube?.
A. To prevent flow separation.
B. To avoid Pressure drag.
C. To prevent rejection of heat.
D. To increase efficiency.
Answer = To prevent flow separation
589. What is the maximum value of efficiency in a draft tube?.
A. 100.0.
B. 50.0.
C. 90.0.
D. 40.0.
Answer = 90.0