Q381
Open questionIn which transportation, decomposed organism and losses N2, O2 and other volatile matter
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Mining Engineering · all questionsCoal Mining
Coal Mining
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504
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Q382
Open questionHow much amount of coal required to produce one tone of petrolium products
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Q383
Open questionIf the size of the pillar is 18 × 18 m is split up in to
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Q384
Open questionThe stowing efficiency in hand packing is
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Q385
Open questionCoal mine operations are prohibited if the depth of cover is less than
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Q386
Open questionThe method of mining not suitable for working coaking coal.
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Q387
Open questionIn which line of extraction the stook is under excessive pressure and liable to crush.
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Q388
Open questionAlluminium hollow drill rods can be used in rotary drilling
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Q389
Open questionDrift theory is one of the reliable theory for formation of coal seam, other theory is
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Q390
Open questionIn most of the cases the thickness of subsod vanes from
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Q391
Open questionHeadings advancing in a direction right angles to the main cleat called
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Q392
Open questionBrown coal is called
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Q393
Open questionTop slicing stoping method belongs to
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Q394
Open questionLife of MS pipe used in stowing . . . . . . . . lac ton of sand.
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Q395
Open questionIn permanent lining, in hard rock the excavation reduced to finished diameter of the shaft and continuous thus for . . . . . . . . below.
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Q396
Open questionThe diameter of drill hole in shaft sinking
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Q397
Open questionThe fall which take place after withdrawl of supports
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Q398
Open question'T' Chisal used in
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Q399
Open questionThe thrower belt is mounted on . . . . . . . . in mechanical stowing.
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Q400
Open questionRotory method may be used with a view to get
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