Drilling And Blasting - Study Mode

[#306] Conventional air lock has . . . . . . . . doors one on each outlet so that when one opens the other encloses the shaft fully.
Correct Answer

(B) Two

[#307] The type of electric motor prefered for large air screw fans . . . . . . . .
Correct Answer

(C) Synchronous induction

[#308] The increased temperature of wet bulb indicates.
Correct Answer

(A) Heating

[#309] Carring of high voltage cables from surface to substation near pit bottom prohibited through UC shaft because of . . . . . . . .
Correct Answer

(B) Warming

[#310] What type of explosives selected to get lump coal.
Correct Answer

(A) Low density