71. Head gear pulleys of over . . . . . . . . m diameter are generally constructed in two halfs and bolted together.
72. Large number of wires in rope is more . . . . . . . .
73. The form of splice used on haulage ropes known as . . . . . . . .
74. The capacity of pump is also called as . . . . . . . .
75. The speed of the rope ranges between . . . . . . . . in endless rope haulage.
76. In Road header machine the following component is employed.
77. A lift suspended from the winding rope, open both ends, whose gates can be positioned called . . . . . . . .
78. Coal plough in employed on . . . . . . . . longwall face with a prop free front.
79. Wire ropes are made of . . . . . . . .
80. There may be one ranging drum at one end of the machine known as
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