Q441
Open questionFreezing process introduced in the year
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Mining Engineering · all questionsCoal Mining
Coal Mining
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Q442
Open questionWhat is the meaning of SWL in material handling
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Q443
Open questionFor employing the French method of extraction of thick seams, seam gredient should not exceed.
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Q444
Open questionMain fall occurs when the area of extraction is nearly equal or more than of the depth.
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Q445
Open questionSliding bolts are provided in
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Q446
Open questionWooden planks made of
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Q447
Open questionIn shallow mines, to prevent breathing of air to the depillared area through cracks on surface, the cracks are blanketted with a layer of sand nearly . . . . . . . . meters thick.
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Q448
Open questionThe saw toothed crown, drill holes of diameter not less than . . . . . . . . are possible.
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Q449
Open questionSand bunkers have a capacity of . . . . . . . . days requirements of sand.
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Q450
Open questionMost common length of face in longwall mining.
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Q451
Open questionThe contribution of tertiary coal is about, what percent of the country coal resources is about.
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Q452
Open questionIn extraction of coal pillars by caving, what should be the maximum area of roof exposure at any working place at any time.
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Q453
Open questionConsider that pillar size is 30 m centre to centre and gallaries are 4 m wide. Find the percentage of extraction.
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Q454
Open questionThe input of water in the mixing cone is measured or calculated by an instrument . . . . . . . .
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Q455
Open questionThe device used for collect the core
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Q456
Open questionThe pillars formed during development are split into small portions called . . . . . . . .
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Q457
Open questionKaolinite chemical is used for
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Q458
Open questionIn longwall advance workings, nearly . . . . . . . . te of sand per te of coal raised is required.
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Q459
Open questionCalyx drilling also called as
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Q460
Open questionConveyor which receives coal from the face conveyor for its transport outbye is
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