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Environmental Engineering in CE

Environmental Engineering in CE
Which is the most widely used coagulant for the treatment of turbid water?

Lime
Ferric chloride
Sodium aluminate
Alum (aluminium sulphate)

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Environmental Engineering in CE
High noise levels produced during operation of fans and compressors can be reduced by using

Accoustical absorbent
None of these
Mufflers (silencers)
Lagging of noisy duct

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Environmental Engineering in CE
Which of the following sources is responsible for maximum air pollution?

Forest fire
Photochemical oxidation of organic matter
Industrial chimney exhaust
Automobiles exhaust

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Environmental Engineering in CE
Dissolved oxygen content in river water is around __________ ppm.

250
500
5
100

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Environmental Engineering in CE
Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause

Non biodegradable foam
Corrosion
Explosion
Undesirable plant growth

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Environmental Engineering in CE
Reingleman chart No. 2 corresponds to __________ percent black smoke.

80
40
20
10

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