A. normal to face
B. inclined at 45° to the face
C. inclined at 15° to the face
D. inclined at 30° to the face
0 Drifters can be used to drill_________________?
0 The correct sequence of drilling equipment for increasing size of holes in tunnels is________________?
A. only up holes
B. only down holes
C. horizontal or up holes
D. horizor„al, down or up holes
0 In compressed air tunneling, the volume of free air provided 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
0 Which of the following lining material is useful for shield driven tunnels in sub aqueous regions ?
A. 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
0 Which one of the following tunnelling methods is used for laying under ground sewers ?
A. stone masonry
B. timber
C. cast iron
D. cement concrete
0 The most suitable soil for compressed air tunneling is________________?
A. Needle beam method
B. Army method
C. German method
D. Italian method
0 Which of the following methods of tunneling is used for long tunnels at great depths ?
A. silt
B. sand
C. clay
D. gravel
0 What is the correct sequence of the following events in rock tunnelling?
A. Army method
B. Needle beam method
C. Austrian method
D. English method
0 Which one of the following is considered to be an advantage of the heading and benching method of tunnel construction?
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