Q421
Open questionThe type of drill bit suitable for any type of rock
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Mining Engineering · all questionsCoal Mining
Coal Mining
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Q422
Open questionIn shallow seams to prevent breathing of air to depillared area through cracks to the surface the cracks have to be blanketted with a minimum thickness of layer of sand or earth nearly
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Q423
Open questionWhen the mineral extracted from underground the void filled with incombustable material, the process called as . . . . . . . .
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Q424
Open questionRoads driven parallel to strike in horizon mining tailed
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Q425
Open questionThe tensile strength of C.I. pipes having
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Q426
Open questionThe method employed, when surface buildings cannot be evacuated
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Q427
Open questionStrong roof and unyielding floor tends to
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Q428
Open questionThe width of rooms in room and pillar mining
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Q429
Open questionAmong permitted and non permitted explosive, which type of explosive has highest consumption in India.
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Q430
Open questionThawing means
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Q431
Open questionEscaped water from weep holes collected in . . . . . . . . at the curbs.
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Q432
Open questionThe purpose of shaft centering arrangement on top of sinking pit
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Q433
Open questionThe advantages of using alluminium rods
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Q434
Open questionThe depillary operations so planned and conducted that
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Q435
Open questionThe chemicals employed in presilicatisation
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Q436
Open questionMild steel pipes have a tensile strength of
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Q437
Open questionHangers diameter are
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Q438
Open questionFastest raising is
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Q439
Open questionA coal bed with a methane content is greater than . . . . . . . . m3/te. has been considered coal and gas out burst prone.
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Q440
Open questionSillicatisation is the process of
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