Q741
Open questionAir crossings in gassy coal mines should be . . . . . . . .
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Mining Engineering · all questionsDrilling and Blasting
Drilling and Blasting
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Q742
Open questionThe country rock present above the vein.
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Q743
Open questionFor ventilating a heading, drift or tunnel.
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Q744
Open questionElectronic anemometers measure air velocities in . . . . . . . . ranges.
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Q745
Open questionThe pit bottom layout withstand . . . . . . . .
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Q746
Open questionSpot coolers used in mining cooling capacity varies from . . . . . . . . in Kcal/hour.
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Q747
Open questionExplosive mixture of gasses is one, which when once ignited, will allow the flame to be self propagated through out the mixture, independent and away from source of ignition called . . . . . . . .
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Q748
Open questionStatic gauge pressure at the inlet of any duct is
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Q749
Open questionSurface screening plant and tipplers should be at least . . . . . . . . away from the intake shaft.
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Q750
Open questionSimplified form of gas mask is
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Q751
Open questionIdentify the figure
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Q752
Open questionStoping is started on each side of . . . . . . . .
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Q753
Open questionThe explosive, it is difficult to detonate it by itself with the help of detonator.
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Q754
Open questionIt is the dimension less characteristic describing the performance of the impeller called . . . . . . . .
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Q755
Open questionMethane content is more in coal that are . . . . . . . .
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Q756
Open questionChecking of the gradent line and extent of the grade line done with the help of
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Q757
Open questionThe evasee chimney of a fan has an area of 4 m2 at the base and 14 m2 at the outlet. Calculate the saving on w.g due to evasee when the output of a fan is 6000 m3/min.
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Q758
Open questionThe lowest temperature to which methane air mixture must be raised in order to set the mixture aflamable called . . . . . . . .
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Q759
Open questionMaximum velocities of ventilating air at stoping
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Q760
Open questionClass 'A' fires involve generaliy quenched by . . . . . . . .
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