Coal Mining - Study Mode
[#191] In most of the cases the thickness of subsod vanes from
Correct Answer
(B) 3 - 20 m
[#192] The best method of mining in seam of 4.8 m thick, 500 m deep and massive sand stone roof.
Correct Answer
(D) L/W in lifts
[#193] In sand stowing incorrect profile will effect
Correct Answer
(A) Cavitations
[#194] The holes to be treated with chemicals known as
Correct Answer
(C) Product holes
[#195] The percussive drilling is applicable upto a maximum depth of . . . . . . . . m.
Correct Answer
(C) 300