91. No mode or type of capping shall be used which fails to withstand a load of atleast 'N' times the maximum static load N is given by . . . . . . . .
92. Which is the ratio of power output to the power input called . . . . . . . .
93. Coal cutting machine is used . . . . . . . .
94. The maganease percentage in wire ropes . . . . . . . .
95. An extensive application in the working of mine pumps based on . . . . . . . .
96. In main and tail rope haulage the tail rope length is . . . . . . . .
97. The safety catches should be inspected . . . . . . . . to prevent accumulation of coal dust to ensure free moves.
98. Name the method of speed control of large winders usually of above 800 kw
99. For deep shafts where high outputs is desirable, best suited winding is . . . . . . . .
100. In LHD system, the transporting scheme is with . . . . . . . .
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