If ‘N’ is the number of shafts used, then the total number of feces available for attacking the excavation and construction in tunnels are_________________________?

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. 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. normal to face
B. inclined at 45° to the face
C. inclined at 15° to the face
D. inclined at 30° to the face

A. 42 D
B. 82 D
C. 104 D
D. 124 D

A. remains same
B. decreases
C. increases by 2.25 times
D. increases by 3.5 times