51. Mining situations which roof is called good and reliable.
52. It is a good practice to keep . . . . . . . . m of coal intact near a shaly roof during development
53. The value of the threshold convergence in long wall mining is . . . . . . . . mm/m.
54. Method of estimation in which shape and size of ore can be estimated called
55. The hydraulic oil used in hydraulic prop may be water with . . . . . . . .% of suitable oil.
56. Which kind of roof weathers quickly when exposed to atmospheric action and spalls off.
57. In case of weak rock over lain by strong rock, the bolt installed through them will act in
58. The widely acceptable theory behind roof bolt is
59. A support with combination of sleepers above one another in a cris-cross manner
60. In high stress zone, the shape of the shaft cross section should be
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