Q861
Open questionThe quantity survey can be made in gassy mines of I degree once in every . . . . . . . . days.
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Mining Engineering · all questionsDrilling and Blasting
Drilling and Blasting
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Q862
Open questionWe understand millisecond as
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Q863
Open questionThe void formed after extraction of solid block of are called.
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Q864
Open questionModerately deep coal mines lie between.
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Q865
Open questionA system of ventilation normally adopted in metal mines is . . . . . . . .
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Q866
Open questionIn controlled blasting the fly rock should not go height more than . . . . . . . .
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Q867
Open questionQuantity of air passing per min at a place given by the formula Q =
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Q868
Open questionA gallery which cuts across the pillars, due to its drivage along apparent dip called
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Q869
Open questionSpeed of coal drill rod.
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Q870
Open questionIt is a good practice the air velocity not be exceed . . . . . . . . m/sec at the face.
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Q871
Open questionMethods commonly employed for drivage of gallens of coal are . . . . . . . .
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Q872
Open questionThe reversal of ventilation may be advantages if fire is in . . . . . . . . shaft.
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Q873
Open questionWhat is the range of heat produced due to oxidation of coal.
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Q874
Open questionAir samples from behind stopping should be between the hours . . . . . . . .
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Q875
Open questionExplosions in coal mines are
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Q876
Open questionIn the mine is running under medium resistance series and parallel fans arrangement gives the same results in the region of about . . . . . . . . % more air.
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Q877
Open questionHow will you decide the diameter of drill rod to be used in UG coal mines?
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Q878
Open questionIt is the area of imaginary opening in a thin plate which offer the same resistance to the passage of air as offered by the mine itself called . . . . . . . .
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Q879
Open questionAn explosive is required to be in normal handling.
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Q880
Open questionSpeed of air in a mine measured by
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