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Environmental Engineering in CE

Environmental Engineering in CE
Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).

0.002
1.2
4.8
0.2

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Environmental Engineering in CE
Biological oxidation ponds remove organic matters present in the polluted water by

Aerobic oxidation
Using the activities of bacteria and other micro organisms
Both A & B
Neither A nor B

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Environmental Engineering in CE
Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.

75
105
95
35

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

10
1000
1
250

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Environmental Engineering in CE
Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water.

Total solids
Color (Hazen)
All of these
Turbidity

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Environmental Engineering in CE
Water effluent generated in printing industry is decolourised by

Electrolytic decomposition
Ion exchange technique
Reverse osmosis
Adsorption

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