81. The main purpose of lea recorder is to calculate sand bunker's . . . . . . . .
82. The discharge of sand given by the formulae Qs =
83. In mechanical stowing, the material has to be deflected on the thrower belt by deflection plates called as . . . . . . . . which drops material into . . . . . . . .
84. The method of sinking through alternate loose and hard strata upto 60 m
85. Nomographs are used for in under ground mining.
86. The charge per hole in BG method.
87. Width of thrower belt . . . . . . . . in mechanical stowing.
88. Caisson methods are commonly adopted for construction of foundation for
89. Saw toothed drill bits are suitable only for drilling through
90. Depillaring below water logged area should be . . . . . . . .
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