61. The machine which cuts the coal while travelling in one direction and loads on return travel.
62. The method of boring the holes drilled by milling action
63. The . . . . . . . . type of explosives used for blasting in shaft sinking
64. The latest technologies employed in shaft sinking machines suitable of diameters a shaft of excavated diameter by drill shafts are
65. The number of pillars in a panel varies from
66. The driving drum rotates at . . . . . . . . giving a thrower belt velocity of . . . . . . . .
67. Hydrogenation first achieved by the scientist
68. No such working shall exceed . . . . . . . . in width a height near water logged area.
69. In depillaring by caving, the type of splitting preferred is
70. Minimum factor of safety in design of pillar in bord and pillar mining.
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