71. Maximum voltage required for longwall face.
72. Bore hole survey means
73. Tubbing thickness depends on . . . . . . . . to withstand
74. In third degree gassy mines the isolation stoppy should be
75. Clay anger used in
76. Maximum roof exposure for stowing is
77. The goaf packed by introducing the material in a stream of compressed air is called . . . . . . . .
78. Percussive drilling the rocks is broken by following action
79. In horizon mining laterals are driven
80. Ventilation by mechanical means is provided in sinking shaft exceeds at a depth of
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