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Environmental Engineering in CE

Environmental Engineering in CE
Threshold limit value (TLV) of CO in air is __________ ppm.

5000
2000
5
50

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

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

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Environmental Engineering in CE
In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.

1 to 2
4 to 5
9 to 10
15 to 20

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Environmental Engineering in CE
Which of the following is a secondary air pollutant?

Photochemical smog
Dust particles
Sulphur dioxide
Nitrogen dioxide

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

1000
100
5
2000

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Environmental Engineering in CE
In large thermal power stations very fine particulates present in flue gas are removed by

Wet scrubber
Electrostatic precipitators
Dust catcher
Bag filter

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