Coal Mining - Study Mode
[#351] Rotory drilling methods are classified in to
Correct Answer
(C) 4
[#352] The sketton rings are also called
Correct Answer
(A) Curb rings
[#353] Number of tonnes of sand required for stowing porton of coal extracted during depellaring . . . . . . . .
Correct Answer
(B) 1.8
[#354] Main purpose of mud flushing
Correct Answer
(D) All these
[#355] Purpose of Brace head in percussive drilling
Correct Answer
(A) Circular hole