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Environmental Engineering in CE

Environmental Engineering in CE
Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called

Mists
Aerosols
Fumes
Smoke

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Environmental Engineering in CE
Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO₂ in air is __________ ppm.

1000
500
5
2000

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Environmental Engineering in CE
The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.

May increase or decrease ; depends on the chemical characteristics of polluted water
Increases
Decreases
Remains constant

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Environmental Engineering in CE
The concentration of water vapour in troposphere, which depends upon the altitude & temperature varies in the range of zero to __________ percent.

1
12
8
4

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Environmental Engineering in CE
Peroxyacyl nitrate (PAN), a pollutant is found in the

Flue gas of coal based power plant
Exhaust of sulphuric acid plant
Automobile exhaust
Exhaust of nitric acid plant

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Environmental Engineering in CE
In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.

15 to 20
1 to 2
9 to 10
4 to 5

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