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Environmental Engineering in CE

Environmental Engineering in CE
The most commonly used chemical coagulant in water treatment is

Alum
Ferrous sulphate
Hydrazine
Lime

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Environmental Engineering in CE
Ionisation potential employed in the industrial electrostatic precipitator is of the order of

230 V AC
30 to 70 kV DC
30 to 70 kV AC
230 V DC

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Environmental Engineering in CE
The lowest layer of atmosphere is known as the

Troposphere
None of these
Stratosphere
Ionosphere

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

Explosion
Non biodegradable foam
Undesirable plant growth
Corrosion

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Environmental Engineering in CE
Which of the following is the most severe air pollutant?

NOx
CO
Hydrocarbons
SO₂

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Environmental Engineering in CE
Acute danger to human life (i.e. death) exists, if the concentration of CO₂ in atmospheric air exceeds __________ percent (by volume).

20
7
3
1

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