EXAMIANS
Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to
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Which of the following acts as a natural source of air pollution?
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Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes
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Noise pollution level in a chemical plant is expressed in
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Which of the following pollutants is absent in the emissions from a fertiliser plant ?
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Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called
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Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels.
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Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes
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The lowest layer of atmosphere is known as the
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Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan
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