The most suitable soil for compressed air tunneling is________________?
The most suitable soil for compressed air tunneling is________________? A. silt B. sandC. clay D. gravel
The most suitable soil for compressed air tunneling is________________? A. silt B. sandC. clay D. gravel
Which one of the following tunnelling methods is used for laying under ground sewers ? A. Needle beam methodB. Army method C. German method D. Italian method
Which of the following lining material is useful for shield driven tunnels in sub aqueous regions ? A. stone masonry B. timberC. cast iron D. cement concrete
In compressed air tunneling, the volume of free air provided is______________? A. 6 mJ per second per m2 of face areaB. 6 m3 per minute per m2 of face area C. 20 m3 per minute per m2 of face area…
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,…
Drifters can be used to drill_________________? A. only up holes B. only down holes C. horizontal or up holesD. horizor„al, down or up holes
A good blast with a good yield is obtained if the cut hole is___________________? A. normal to faceB. inclined at 45° to the face C. inclined at 15° to the face D. inclined at 30° to the face