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7.

In "full face" method of constructing tunnels, the first operation relates to                        
A. removal of bottom portion B. excavation of one drift in the center
C. removal of top portion D. excavation being done along the periphery



8.

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



9.

The correct sequence of drilling equipment for increasing size of holes in tunnels is                        
A. wagon drill, churn drill, shot drill B. wagon drill, shot drill, churn drill
C. shot drill, churn drill, wagon drill D. churn drill, wagon drill, shot drill




10.

The most suitable soil for compressed air tunneling is                        
A. silt B. sand
C. clay D. gravel



11.

What is the correct sequence of the following events in rock tunnelling?
1.marking tunnel profile
2.loading explosives and blasting
3.checking misfire
4.mucking
5.removing foul gas
6.setting up and drilling
7.guniting
Select the correct answer using the codes given below Codes:                        
A. 1,6,5,3,4,2,7 B. 1,2,6,3,5,4,7
C. 1, 6,2, 5,4, 3, 7 D. 1,6,2,5,3,4,7



12.

Which of the following is not a component of the shield ?                        
A. propelling jacks B. liner plate
C. hood D. tail



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