How the anemometer is used to determine the average velocity of air?
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Mining Engineering · all questionsMine Environment
Mine Environment
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The important gaseous pollutants, contributing to acid rains, are
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The delay between the ignition and the application of the heat source termed as
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A high volume air sampler is operated for 8 hrs in a mine with the flow rate of air varying from 1.5 m3/min to 1.3 m3/min. The empty weight of the filter paper is 2.30 g and the final weight is 2.65 g. The mean concentration of the suspended particulate matter (SPM) during the study period in μg/m3 is
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What is the center frequency of the band number whose lower and upper bands are 1414 and 2828 Hz respectively?
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The primary aim of ventilation control in the event of fires is
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The curvature of diffuser vane shall be so fixed that the fluid enters the guide passage with minimum loss. This is possible only when
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What is the mass of 1 m3 CH4 at NTP?
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What should be minimum quantity of air to be circulated along a long wall face at its maximum speed of 7.5m for a 3m thick gassy seam of 3rd degree?
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Hairs of our nose can remove all particles of size, greater than
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Stink damp is synonymous with
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When the effect of surface temperature on natural ventilation will be less or negligible?
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In ambient air of industrial area, the permissible concentration of particulate matter less than 2.5 μm size measured on 24 hours average in μg/m3 is
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It is the ratio of the power actually absorbed by the impeller and converted into the head of the power applied to the shaf
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The temperatures in upcast shaft & downcast shaft are 40°C & 30°C respectively. Shaft is 350 m deep. Find the height of motive column?
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CO2 is treated as best extinguisher for
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The nature of flow of a fluid is governed by a dimensionless parameter called
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Natural ventilation can be caused by
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During hard work e.g. shoveling, tramming, the metabolic heat rate (W m-2) from the body surface of an average person is in the range of
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Which of the following pairs is correctly matched?
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