Coal Mining - Study Mode
[#161] Coincident verticality of pillars in multisection working is not required to be maintained when the strata are inclined at an angle of more than . . . . . . . .
Correct Answer
(C) 30°
[#162] Improved technique of removal of core during drilling without raising of drill rods
Correct Answer
(D) Wire line drilling
[#163] The machine which cuts the coal while travelling in one direction and loads on return travel.
Correct Answer
(A) Plough
[#164] The method of boring the holes drilled by milling action
Correct Answer
(C) Chilled shot
[#165] The . . . . . . . . type of explosives used for blasting in shaft sinking
Correct Answer
(A) Gelatinous