Drilling And Blasting - Study Mode
[#696] How much time to be taken to enter in a place, where electric blasting done.
Correct Answer
(A) 5 min
[#697] In a mine ventilation district of deg. II and deg. III, percentage of CH 4 exceeds 1.25 at any time the electric supply should be . . . . . . . .
Correct Answer
(B) cut off
[#698] An explosive used in quarries has to be
Correct Answer
(B) Non cap sensitive
[#699] Dry powder extinguishers used to deal with fire of type . . . . . . . .
Correct Answer
(D) All of these
[#700] The distance between Buffer to interconnected stop block and runaway switch is nearly equals to a length of set of tubs plus.
Correct Answer
(D) 4.5 m