A person inhales . . . . . . . . 1/min, the O2 consumption . . . . . . . . 1/min, when doing hard work in pauses.
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Mining Engineering · all questionsDrilling and Blasting
Drilling and Blasting
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If the patient needs more than 30 1/min., draws additional air through the . . . . . . . . value on the mask, in reviving apparatus.
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Laboratory experiments proved, suddenly comprising gas air mixture of containing as low as . . . . . . . . % and as high as . . . . . . . . % firedamp can be ignited and made explosive both the temp. and pressure raised simultaniously.
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In very thick seams the thickness of coal is . . . . . . . .
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The pressure of forcing fan has effect of keeping the gases in . . . . . . . .
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For introduction of solid blasting need apporval from DGMS for exemption under following regulation.
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Water infusion is one of the method of prevention of dust at the faces.
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When coal dust propagates explosion . . . . . . . . as in case of gas explosion.
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Coal more liable to spontanious heating when thesebands present
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If the deficiency ratio is 3% or more it indicates . . . . . . .
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The constant feed rate of BG 174 apparatus is . . . . . . . . It/min.
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The weight of spiral - 2C apparatus.
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Ventilation survey means
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Class 8 group explosives are
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A rescue station is under the control of . . . . . . . .
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Cactus grab is employed in . . . . . . . .
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Every shot-firing apparatus needs to be tested at what minimum intervals as stated in CMR 2017?
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Conditions for deep hole blasting shall be specified in a general order by whom?
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In a sealed off fire area as the O2 of the trapped mine air consumed its pressure becomes less than the atmospheric air of the mine and fresh air leaks in to fire area, called.
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Silica gel in gas mask removes . . . . . . . .
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