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Environmental Engineering in CE

Environmental Engineering in CE
Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels.

200
120
140
170

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

Ion exchange technique
Adsorption
Electrolytic decomposition
Reverse osmosis

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Environmental Engineering in CE
High noise levels produced during operation of fans and compressors can be reduced by using

Lagging of noisy duct
Accoustical absorbent
None of these
Mufflers (silencers)

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

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

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

Coal
Silica
None of these
Iron

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Environmental Engineering in CE
Presence of __________ in water stream are deleterious to aquatic life.

All of these
Suspended solids
Heavy metals and cynides
Soluble and toxic organics

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