Which of the following methods of tunneling is used for long tunnels at great depths ?
(A) Army method
(B) Needle beam method
(C) Austrian method
(D) English method
The most suitable soil for compressed air tunneling is________________?
(A) silt
(B) sand
(C) clay
(D) gravel
Which one of the following tunnelling methods is used for laying under ground sewers ?
(A) Needle beam method
(B) 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) timber
(C) 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 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
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, shot drill
Drifters can be used to drill_________________?
(A) only up holes
(B) only down holes
(C) horizontal or up holes
(D) horizor„al, down or up holes
A good blast with a good yield is obtained if the cut hole is___________________?
(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
PERT technique of network analysis is mainly useful for__________________?
(A) small projects
(B) large and complex projects
(C) research and development projects
(D) deterministic activities
As compared to a single free face, if a charge of explosive is placed equidistant from two faces, then the yield___________________?
(A) remains same
(B) decreases
(C) increases by 2.25 times
(D) increases by 3.5 times