41. Wary undulations developed in rocks, whenever the region is subjected to severe pressure
42. While working seams steeper than 1 in 4 except the haulage dip the cross connections between the levels should be
43. Diamond drilling is applicable upto a maximum depth of . . . . . . . . m.
44. In deciding the size of the panel the important factor to be considered is
45. The collapse of roof in the goaf which is delibarately brought about by withdrawal of roof supports called
46. Room and pillar method used, when
47. The holes in BG method are inclined . . . . . . . . degrees from vertical towards roof
48. Length of simple unit face commonly with AFC.
49. Speed of wireline drilling equipment is
50. During depillaring, no splitting or reduction of pillars should be done beyond a length of pillars ahead of . . . . . . . . pillar under extraction.
Read More Section(Coal Mining)
Each Section contains maximum 100 MCQs question on Coal Mining. To get more questions visit other sections.