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