Coal Mining - Study Mode
[#266] Room and pillar mining employed at depth below . . . . . . . . meters.
Correct Answer
(C) 300
[#267] The core sizes whose wire line drilling technique is adopted are for BX holes
Correct Answer
(A) 25mm
[#268] Barrier in between panels is preferably puncture at 'A' number of places. 'A' is given by
Correct Answer
(D) 1
[#269] Dewatering can be done by using the drill machines like
Correct Answer
(A) Jack hammer
[#270] Rock formed by errosion, weathering, transportation and ultimately deposition of pre-existing rock
Correct Answer
(B) Metamorphic rocks