Q361
Open questionStables usually . . . . . . . . ahead of face in advancing longwall.
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Mining Engineering · all questionsCoal Mining
Coal Mining
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504
Questions
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Q362
Open questionThe width of the headings in bord and pillar method depend on
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Q363
Open questionIn sand stowing high local velocity of sand results.
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Q364
Open questionThe pillar is splitted into 2 or more stooks of the pillar size is more than . . . . . . . .
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Q365
Open questionLength of wooden planks used in temporary lining
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Q366
Open questionDeposit contain atleast certain percentage of metal in it, lowest limit of metallic content of ore
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Q367
Open questionMajor factors affecting deviation are
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Q368
Open questionThe diameter of scaffold is slightly less than the . . . . . . . . diameter of the shaft
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Q369
Open questionA district separated from other districts by a barrier called . . . . . . . .
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Q370
Open questionFor wire line drilling, length of core barrels are
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Q371
Open questionRoom and pillar mining confined to almost . . . . . . . seams.
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Q372
Open questionCast iron lining called
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Q373
Open questionDuring extraction of coal . . . . . . . . will be left against the goaf.
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Q374
Open questionWhen the water perculation of strata only this is required
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Q375
Open questionThe blasted debries is taken to the surface-by means . . . . . . . . in shaft sinking
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Q376
Open questionStowing capacity in case of mechanical stowing.
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Q377
Open questionThe quantity of coal available in a coal seam insitu called
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Q378
Open questionSpan detressed zone irrespective of depth is . . . . . . . . m.
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Q379
Open questionThe main requirement to convert coal into petrolium by synthesis to increase the proportion of
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Q380
Open questionThe minimum thickness of the seam to adopt BG method.
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