Q541
Open questionIf the depth of workings of coal mine below 200 m said to be . . . . . . . .
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Mining Engineering · all questionsDrilling and Blasting
Drilling and Blasting
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Q542
Open questionThe relation between size of coal and total methane gas content emitted at face.
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Q543
Open questionWater CO2 extinguishers suitable only for quency of . . . . . . . .
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Q544
Open questionAn explosive used in underground mines has to be
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Q545
Open questionThe fan is more or less permanent installation
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Q546
Open questionIf the resistance of a roadway 50 m long, 6 m3 cross section being equal to . . . . . . . . kilo murg.
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Q547
Open questionA detonating fuse like cordtex is generally used in
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Q548
Open questionIn inclined manometer, alchohol prefered due to
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Q549
Open questionHow much time to be taken to enter in a place, where electric blasting done.
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Q550
Open questionIn a mine ventilation district of deg. II and deg. III, percentage of CH4 exceeds 1.25 at any time the electric supply should be . . . . . . . .
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Q551
Open questionThe complete weight of Novex reviving apparatus is . . . . . . . . Kgs.
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Q552
Open questionThe isolation stoppings should be well locked into the roof, floor, sides the minimum depth of locking should be shale.
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Q553
Open questionWhen O2 falls to 10% or low and CH4 rises to 16% or more in fire stopping the samples collected at intervals of . . . . . . . .
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Q554
Open questionThe Manager while fixing maximum number of shots to be fired by the Shotfirer in a shift consider some important issues or parameters. Which of the below mentioned issue or parameter is not considered?
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Q555
Open questionA person inhales . . . . . . . . l/min, the O2 consumption . . . . . . . . l/min, when walking with load.
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Q556
Open questionThe person engaged on drifting work were on the principle of . . . . . . . .
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Q557
Open questionIn smoke helmet/hose mask these apparatus the wearer to depend upon the other man for supply of . . . . . . . ., the wearer himself working in irrespirable air.
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Q558
Open questionThe explosive in sinking shaft is mainly carried out by . . . . . . . .
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Q559
Open questionCO2 gas type extinguishers are used quench . . . . . . . . type fires.
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Q560
Open questionShale pieces in contact with coal are known to . . . . . . . . spontanious heating.
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