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Environmental Engineering in CE

Environmental Engineering in CE
TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.

2000
5
100
1000

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Environmental Engineering in CE
Maximum permissible turbidity in potable water is __________ ppm.

1000
250
10
1

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Environmental Engineering in CE
Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in

Food industry
Iron & steel plant
Municipal sewage treatment
Petroleum refinery

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Environmental Engineering in CE
Presence of soluble organics in polluted water causes

Fire hazards
Explosion hazards
Undesirable plants growth
Depletion of oxygen

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Environmental Engineering in CE
Which of the following industries discharge mercury as a pollutant?

Phosphoric acid plant
Beverage plant
Tanneries
Chloro-alkali industry

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Environmental Engineering in CE
Maximum permissible residual chlorine in treated water should be __________ mg/litre.

5 to 10
02 to 0.3
2 to 3
0.001 to 0.01

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