Coal Mining - Study Mode
[#146] Which drill machine can control flow of water during drilling
Correct Answer
(D) Volsafe drill
[#147] The type of permanent lining employed where running sand encountered during sinking
Correct Answer
(A) Cast iron lining
[#148] If the pillars are not strong, they may be crushed due to sudden pressure called
Correct Answer
(B) Over riding
[#149] Geothermic gradient in high in
Correct Answer
(C) Coal mines
[#150] Tail gate supported by hydraulic props with 'I' section channel bars upto . . . . . . . . from face.
Correct Answer
(B) 30 m