Chemical Engineering :: Environmental Engineering
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Pick out the wrong statement.
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Peroxyacyl nitrate (PAN), a pollutant is found in the
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Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water.
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Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).
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Pick out the wrong statement.
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Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters?
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COD of raw municipal sewage may be in the range of about __________ mg/litre.
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Presence of __________ hardness is responsible for the temporary hardness in water.
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Dose of chlorine for disinfection of water is about __________ mg/litre of water.
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A.
Biological oxygen demand (B.O.D.) value of a sewerage sample is always lower than its chemical oxygen demand (C.O.D.) value.
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B.
Environmental pollution by NOx emission is much higher by four stroke petrol engines as compared to the two stroke engines.
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C.
Temperature in stratosphere rises with increasing altitude.
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D.
The characteristic of a green house body is that it allows the long wavelength incoming solar radiation to come in but does not allow the short wavelength infra red radiation to escape out of the earth's atmosphere.
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A.
Catalytic converter is fitted in automobiles to reduce carbon monoxide concentration in exhaust emissions.
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B.
Inhalation of pollutant carbon monoxide results in death by asphyxiation.
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C.
Sulphur dioxide is the main pollutant emitted from the exhaust of petrol driven automobiles.
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D.
Decomposition of plants containing chlorophyll is a natural source of carbon monoxide in atmosphere.
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