Category: Tunnel Engineering

A. 2N
B. N + 2
C. 2 N + 1
D. 2 N + 2

A. only up holes
B. only down holes
C. horizontal or up holes
D. horizor„al, down or up holes

A. It is suitable for construction in unstable rocks
B. In this method, it is easy to install timber support
C. Tunnelling can be continuous and the work can be expedited
D. In case of excessive water, it is easy to take correct steps

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

A. Needle beam method
B. Army method
C. German method
D. Italian method

A. liner plate
B. trench jack
C. stiffener
D. cutting edge

A. propelling jacks
B. liner plate
C. hood
D. tail