EXAMIANS
The upper layer of atmosphere is called the
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Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about __________ decibels.
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Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.
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Aerobic biological oxidation ponds used for the purification of polluted water
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A shallow pond in which the sewage is retained and biologically treated is called
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Noise pollution level in a chemical plant is expressed in
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Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about __________ decibels.
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Aerosols present in atmospheric air may be
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Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.
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Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by
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