A. silt
B. sand
C. clay
D. gravel
The most suitable soil for compressed air tunneling is________________? Read More »
Tunnel Engineering A. Needle beam method
B. Army method
C. German method
D. Italian method
Which one of the following tunnelling methods is used for laying under ground sewers ? Read More »
Tunnel Engineering A. stone masonry
B. timber
C. cast iron
D. cement concrete
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
In compressed air tunneling, the volume of free air provided is______________? Read More »
Tunnel Engineering 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
A. only up holes
B. only down holes
C. horizontal or up holes
D. horizor„al, down or up holes
Drifters can be used to drill_________________? Read More »
Tunnel Engineering 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
A good blast with a good yield is obtained if the cut hole is___________________? Read More »
Tunnel Engineering