Q241
Open questionMethane drainage was first fried in the colliery in Ruhr coal field of . . . . . . . . in 1943.
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Mining Engineering · all questionsMine Ventilation
Mine Ventilation
practice.
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440
Questions
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Q242
Open questionCMRS has patented a H2S detector tube which detects . . . . . . . . ppm of H2S.
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Q243
Open questionMethane can form a layer along the floor of the workings, if the density of the gas mixture more than
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Q244
Open questionThe percentage of methane present in mine air by volume.
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Q245
Open questionMethane accumulates in mins in
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Q246
Open questionDGMS has approved this type for use for all degree of gassy mines in coal.
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Q247
Open questionName the gas which is not dangerous
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Q248
Open questionThe liquid employed in Fortin barometer
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Q249
Open questionThe alarm range of BCO-1 CO detector . . . . . . . . of CO.
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Q250
Open questionWhat is the minimum % of methane concentration a oil safety lamp can measure.
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Q251
Open questionH2S is . . . . . . . . gas.
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Q252
Open questionThe temperature of the rock is constant at a depth of . . . . . . . . m from surface.
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Q253
Open questionThe cap lamp used by the miners is
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Q254
Open questionThe R.H near sea shore is
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Q255
Open questionThe mine air should not contain less than . . . . . . . .% of O2 and . . . . . . . .% CO2.
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Q256
Open questionSpecific gravity of CO is
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Q257
Open questionThe range of PS CO detector instrument is to detect . . . . . . . . of CO%.
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Q258
Open questionBefore cap test with the cap lamp, which test is carried out
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Q259
Open questionThe R.H value in arid regions is rarely less than
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Q260
Open question40% of black damp (60% air i.e. 12% O2 and 5% CO2) physiological effect on human body is . . . . . . . .
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