81. In which transportation, decomposed organism and losses N2, O2 and other volatile matter
82. How much amount of coal required to produce one tone of petrolium products
83. If the size of the pillar is 18 × 18 m is split up in to
84. The stowing efficiency in hand packing is
85. Coal mine operations are prohibited if the depth of cover is less than
86. The method of mining not suitable for working coaking coal.
87. In which line of extraction the stook is under excessive pressure and liable to crush.
88. Alluminium hollow drill rods can be used in rotary drilling
89. Drift theory is one of the reliable theory for formation of coal seam, other theory is
90. In most of the cases the thickness of subsod vanes from
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