Which of the following methods of tunneling is used for long tunnels at great depths ?
The most suitable soil for compressed air tunneling is________________?
Which one of the following tunnelling methods is used for laying under ground sewers ?
Which of the following lining material is useful for shield driven tunnels in sub aqueous regions ?
In compressed air tunneling, the volume of free air provided is______________?
The correct sequence of drilling equipment for increasing size of holes in tunnels is________________?
Drifters can be used to drill_________________?
A good blast with a good yield is obtained if the cut hole is___________________?
PERT technique of network analysis is mainly useful for__________________?
As compared to a single free face, if a charge of explosive is placed equidistant from two faces, then the yield___________________?
