EXAMIANS
Presence of bacteria in potable (drinking) water causes
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Tolerable limit of nitrogen oxides in air is __________ ppm.
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Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water.
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In large thermal power stations very fine particulates present in flue gas are removed by
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Iron & manganese present in the polluted water is removed by
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TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.
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Color test of water is done with an instrument called
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COD of raw municipal sewage may be in the range of about __________ mg/litre.
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The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the
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If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur.
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