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Environmental Engineering in CE

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

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

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Environmental Engineering in CE
The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the

None of these
Stratosphere
Ionosphere
Troposphere

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Environmental Engineering in CE
Most efficient and suitable dust removal equipment for removal of flyash from flue gas in a thermal power plant is the

Bag filter
Cyclone separator
Gravity settling chamber
Electrostatic precipitator

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Environmental Engineering in CE
Dust collection efficiency of a cyclone separator depends upon its

Diameter
Overall height
All of these
Inlet gas velocity

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

Hydrated lime
Chloramine
Ferrous sulphate
Aluminium sulphate

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Environmental Engineering in CE
Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause

Corrosion
Explosion
Undesirable plant growth
Non biodegradable foam

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