6. Drifters can be used to drill
a) only up holesb) only down holes
c) horizontal or up holes
d) horizontal, down or up holes
Ans: d
7. If 'N' is the number of shafts used, then the total number of feces available for attacking the excavation and construction in tunnels area) 2N
b) N + 2
c) 2 N + 1
d) 2 N + 2
Ans: d
8. The correct sequence of drilling equipment for increasing size of holes in tunnels isa) 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
Ans: a
9. Which of the following is not a component of the shield ?
a) propelling jacksb) liner plate
c) hood
d) tail
Ans: b
10. In compressed air tunneling, the volume of free air provided isa) 6 mJ per second per m2 of face area
b) 6 m3 per minute per m2 of face area
c) 20 m3 per minute per m2 of face area
d) 6 m3 per hour per m2 of face area
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