Q361
Open questionThe liquid employed in kata thermometer.
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Mining Engineering · all questionsMine Ventilation
Mine Ventilation
practice.
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440
Questions
19/22
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Q362
Open question1 mm Hg difference for every . . . . . . . . m vertical difference.
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Q363
Open questionThe gas which is produced by when coal containing sulphur is heated out of contact with air to a temperature of about
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Q364
Open questionCritical temperature of oxygen.
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Q365
Open questionIn deep mines 1000 - 1500 m deep the air pressure is about . . . . . . . .% more than at surface.
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Q366
Open questionFlame safety lamp light diminishes increasing 5% of black damp, light diminished by . . . . . . . .
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Q367
Open questionThe effect of breathing air containing CO in air is 0.2%.
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Q368
Open questionThe methane find in the working in following ways.
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Q369
Open questionThe weight of AFD . . . . . . . . without battery.
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Q370
Open questionWhich is formed in stagnent water in old workings in the area of goaf.
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Q371
Open questionThe formulate for finding the vertical water gauge by inclined manometer is
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Q372
Open questionThe percentage of CO2 present in atmospheric air by volume.
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Q373
Open questionInclined manometers, used to measure very small differences of pressure upto . . . . . . . . mm of water.
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Q374
Open questionInhalation of pure O2 under normal pressure of upto . . . . . . . . hours no harmful effect.
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Q375
Open questionIn a controlled recirculation system, there can not be provision to supress.
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Q376
Open questionThe silver coin turns black in the present of . . . . . . . . gas.
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Q377
Open questionThe percentage of N2 present in atmospheric air by weight (including all innert gases).
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Q378
Open questionThe speed of centrifugal fan varies from . . . . . . . .
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Q379
Open questionThe percentage of CO2 present in mine air by volume.
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Q380
Open questionIn metal mines stink damp produced by the action of . . . . . . . . water on sulphide are
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