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. 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. remains same
B. decreases
C. increases by 2.25 times
D. increases by 3.5 times
A. removal of bottom portion
B. excavation of one drift in the centre
C. removal of top portion
D. excavation being done along the periphery
A. Needle beam method
B. Army method
C. German method
D. Italian method
A. only up holes
B. only down holes
C. horizontal or up holes
D. horizor„al, down or up holes
Consider the following situations
1. Soil is soft
2. Volume of existing surface traffic on the alignment is heavy
3. Track is at a deeper level
4. Water table is high
A. 1 and 2
B. 1 and 3
C. 1 and 4
D. 2 and 3