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Environmental Engineering in CE

Environmental Engineering in CE
Tolerable limit of nitrogen oxides in air is __________ ppm.

5
0.1
25
1

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Environmental Engineering in CE
The length of rectangular sedimentation tank should not be more than(Where ‘B’ is the width of the tank)

4B
2B
B
8B

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Environmental Engineering in CE
__________ substances present in sewage are removed in grit chamber during sewage treatment.

Organic
Inorganic
Dissolved
Fatty

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Environmental Engineering in CE
The main type of sludge gas evolved during sewage treatment in Imhoff tank is

CO
CO₂
CH₄
H₂

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Environmental Engineering in CE
Main pollutants released from iron & steel industry is

SO₃, NO₂ & CO₂
CO, CO₂ & SO₂
H₂S, NO & SO₃
CO₂, H₂S & NO₂

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Environmental Engineering in CE
Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm)?

Sulphur dioxide
Peroxyacyl nitrate
Benzopyrene
Carbon monoxide

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