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Environmental Engineering in CE

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

250
10
1000
1

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Environmental Engineering in CE
Corrosion in boilers can be prevented by

Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion
Deaeration of feed water
All of these
Enhancing pH of feed water by adding alkali

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Environmental Engineering in CE
Siderosis is a disease caused by the inhalation of __________ dust.

Silica
Coal
Iron
None of these

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Environmental Engineering in CE
Which of the following processes is involved in the biochemical treatment of sewage effluents?

Oxidation
Fermentation
Dehydration
Reduction

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Environmental Engineering in CE
Noise level during normal conversation among men is about __________ decibles.

45
90
10
115

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Environmental Engineering in CE
The earth's atmosphere is an envelope of gases present upto a height of about __________ kms.

1000
10
2000
200

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