81. In a seam with loco haulage system the junctions with main haulage are staggered.
82. How many coal seams belong to Barakar formation
83. Limiting gradient for longwall mining.
84. The sudden release of elastic strain energy stores in pillars which results violent burst of coal pillars called
85. Width of workings from goaf line of face . . . . . . . .
86. The purpose of treatment of holes with chemicals silicate of soda and alluminium sulphate is to reduce
87. Pressure bumps occur
88. For design of pillars used is
89. The hydraulic profile H : L ratio generally for reasonable good stowing rate is
90. Derrick made of
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