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Environmental Engineering in CE

Environmental Engineering in CE
Pick out the one which is not a chemical coagulant.

Aluminium sulphate
Ferrous sulphate
Hydrated lime
Chloramine

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Environmental Engineering in CE
Which of the following is not a natural source of air pollution?

Volcanic eruptions and lightening discharges
None of these
Biological decay of vegetable matter
Photochemical oxidation of organic matter

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Environmental Engineering in CE
COD of raw municipal sewage may be in the range of about __________ mg/litre.

90-120
1500-2500
5-10
1-2

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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
Main pollutants released from iron & steel industry is

CO₂, H₂S & NO₂
CO, CO₂ & SO₂
H₂S, NO & SO₃
SO₃, NO₂ & CO₂

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Environmental Engineering in CE
__________ is removed from water by lime-soda process.

Foul smell and taste
Temporary hardness
Permanent hardness
Iron and manganese

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