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Environmental Engineering in CE

Environmental Engineering in CE
Tri-sodium phosphate is used in boiler water treatment to reduce

Suspended silica
Dissolved oxygen
Turbidity
Caustic embrittlement

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Environmental Engineering in CE
A shallow pond in which the sewage is retained and biologically treated is called

Lagoon
Imhoff tank
Oxidation
Skimming tank

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Environmental Engineering in CE
Infective bacteria in water is killed by the __________ process.

Disinfection
None of these
Sterilisation
Aeration

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Environmental Engineering in CE
Smog is

A solid particle e.g. flyash
A liquid particle resulting from vapor condensation
Nothing but black smoke
A combination of smoke and fog

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

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

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Environmental Engineering in CE
Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur?

Troposphere
Thermosphere
None of these
Stratosphere

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