A. 2 m
B. 3 m
C. 4 m
D. 5 m
i) is suitable for large sized tunnels
ii) is no,’ suitable for railway or highway tunnel’s
iii) requires heavy timbers
select the correct answer?
A. only (i) is correct
B. (i) and (iii) are correct
C. (ii) and (iii) are correct
D. (i) and (ii) are correct
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. Needle beam method
B. Army method
C. German method
D. Italian method
A. 2N
B. N + 2
C. 2 N + 1
D. 2 N + 2
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. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true