Environmental Engineering - Chemical Engineering Questions and Answers

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Ozone is

a primary pollutant.

a secondary pollutant.

impervious to ultra-violet rays.

both (b) and (c)

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The permissible color for domestic water supply is __________ ppm.

100

1000

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High noise levels produced during operation of fans and compressors can be reduced by using

mufflers (silencers).

accoustical absorbent.

lagging of noisy duct.

none of these.

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The Killer gas which caused Bhopal gas tragedy in 1984 was

phosgene

methyl iso-cynate (MIC)

carbon monoxide

sulphur dioxide

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Aerosols present in atmospheric air may be

positively charged.

negatively charged.

neutral.

combination of all (a), (b) & (c).

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Ethanolamine is an absorbant used for the removal of __________ from air/gas.

SO₂

H₂S

both (b) & (c)

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Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm) ?

Benzopyrene

Peroxyacyl nitrate

Carbon monoxide

Sulphur dioxide

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__________ plant emits large amount of SO₂ as an air pollutant.

Nitric acid

Sulphuric acid

Chloralkali

Iron & steel

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Noise pollution level in a chemical plant is expressed in

roentgen

decibel

hertz

none of these