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Chemical Engineering - Environmental Engineering

Exercise : Environmental Engineering - Section 2
21.
Pick out the wrong statement.
Biological oxygen demand (B.O.D.) value of a sewerage sample is always lower than its chemical oxygen demand (C.O.D.) value.
Environmental pollution by NOx emission is much higher by four stroke petrol engines as compared to the two stroke engines.
Temperature in stratosphere rises with increasing altitude.
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.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
Peroxyacyl nitrate (PAN), a pollutant is found in the
automobile exhaust.
flue gas of coal based power plant.
exhaust of nitric acid plant.
exhaust of sulphuric acid plant.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water.
turbidity
color (Hazen)
total solids
all (a), (b) & (c)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).
1-2
5-10
15-20
25-30
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
Pick out the wrong statement.
Catalytic converter is fitted in automobiles to reduce carbon monoxide concentration in exhaust emissions.
Inhalation of pollutant carbon monoxide results in death by asphyxiation.
Sulphur dioxide is the main pollutant emitted from the exhaust of petrol driven automobiles.
Decomposition of plants containing chlorophyll is a natural source of carbon monoxide in atmosphere.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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