Coal Mining - Study Mode
[#196] The water bearing quality of seam is measured by the
Correct Answer
(C) Ratio between the quantity of water pumped and ton of coal raised
[#197] In hydraulic sand stowing the throw of the sand without nozzle is . . . . . . . . m and with nozzle is . . . . . . . . m.
Correct Answer
(D) 3, 7
[#198] The purpose of boring is
Correct Answer
(D) All these
[#199] The pressure on diamonds is between during drilling
Correct Answer
(B) 1.5 - 2 Kgf/cm 2
[#200] Chilled shot drilling suitable for drilling vertical and large diameter holes of
Correct Answer
(B) 100 - 750 mm