81. The amount of margin . . . . . . . . in meters allows a cage to be lifted for materials to be slung beneath it.
82. One of the Loco haulage is . . . . . . . .
83. Electric drills commonly used for . . . . . . . .
84. The drill manufactured by Atlas Copco Ltd. under the trade name of . . . . . . . .
85. Jack hammer drill used for vertically downward drilling upto a depth of . . . . . . . . m.
86. If any break down take place in endless haulage, the whole system comes to . . . . . . . .
87. The wire ropes required to be used in wet shafts are . . . . . . . .
88. The cutter loader machines work on gradients upto . . . . . . . . degress.
89. The shearer cuts the coal and loads into . . . . . . . .
90. In coal plough machine, the following component is employed.
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