61. Which is used for raising and lowering of rods of square section
62. Hydrogenation of tar obtained by the process of
63. Percussive drilling methods classified in to
64. Shock bumps occurs in
65. For adoption of hydraulic sand stowing, the availability of sand from rivers flowing near the collieres within . . . . . . . . Km.
66. Controlling the course of bore hole to follow predetermined path and complete the hole at desired surface location called
67. Length of rooms and room and pillar mining
68. In B.G the entire operation of drilling, blasting takes about
69. Coincident verticality of pillars in multisection working is not required to be maintained when the strata are inclined at an angle of more than . . . . . . . .
70. Improved technique of removal of core during drilling without raising of drill rods
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