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Environmental Engineering in CE

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

Sterilisation
Aeration
None of these
Disinfection

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Environmental Engineering in CE
Which of the following is the most detrimental for water used in high pressure boiler?

Dissolved oxygen
Turbidity
Silica
Phenol

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Environmental Engineering in CE
Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).

Moderately
Extremely
Very extremely
Highly

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Environmental Engineering in CE
In a sedimentation tank, the detention period for water ranges from __________ hours.

8 to 12
24 to 32
16 to 20
2 to 4

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Environmental Engineering in CE
Which of the following fine dust removal equipments is the most efficient?

Scrubber
Bag filter
Electrostatic precipitator
Cyclone separator

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Environmental Engineering in CE
Direct reaction of unsaturated hydrocarbons with either NO or NO₂ produces an eye irritating pollutant compound known as

Benzopyrene
Photochemical smog
Poly acrylonitrile
Peroxy acetyl nitrate (PAN) or methyl nitrile

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