1. In a cavity wall, both leaves of which are load bearing, the effective thickness is taken as________________?.
A. sum of thickness of both leaves
B. two-third of the sum of thickness of both the leaves
C. actual thickness of the stronger leaf
D. larger of (B) and (C).
Answer = larger of (B) and (C)
2. Which one of the following is a component of a shield for tunnelling ?.
A. liner plate
B. trench jack
C. stiffener
D. cutting edge.
Answer = cutting edge
3. Drift method of tunnelling is used to construct tunnels in__________________?.
A. soft grounds
B. rock
C. self supporting grounds
D. broken grounds.
Answer = rock
4. In Belgium method of tunneling _________________?.
A. construction of side walls is completed before invert and roof arch are built
B. construction of roof arch is completed before side walls and invert are built
C. construction of invert is completed before side walls and roof arch are built
D. construction of invert and side walls is completed before roof arch is built.
Answer = construction of roof arch is completed before side walls and invert are built
5. Ribs are used for strengthening and stiffening the liner plate for tunnels of diameter greater than_____________________?.
A. 2 m
B. 3 m
C. 4 m
D. 5 m.
Answer = 3 m
6. If 'D' is the diameter of tunnel in meters, then the thickness of lining in mm, as per the empirical formula is given by_________________?.
A. 42 D
B. 82 D
C. 104 D
D. 124 D.
Answer = 82 D
7. Which of the following is not a component of the shield ?.
A. propelling jacks
B. liner plate
C. hood
D. tail.
Answer = liner plate
8. If 'N' is the number of shafts used, then the total number of feces available for attacking the excavation and construction in tunnels are_________________________?.
A. 2N
B. N + 2
C. 2 N + 1
D. 2 N + 2.
Answer = 2 N + 2
9. Circular section of tunnels is not suitable for________________?.
A. carrying water
B. non-cohesive soils
C. tunnels driven by shield method
D. placement of concrete lining.
Answer = placement of concrete lining
10. As compared to a single free face, if a charge of explosive is placed equidistant from two faces, then the yield___________________?.
A. remains same
B. decreases
C. increases by 2.25 times
D. increases by 3.5 times.
Answer = increases by 2.25 times
11. Assertion A : English method of tunneling requires more time as compared to other methods of tunneling. Reason R : In English method of tunneling, the masons and excavators have to work alternately/.
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true and R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true..
Answer = Both A and R are true and R is the correct explanation of A.