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Environmental Engineering in CE

Environmental Engineering in CE
Which of the following processes is involved in the biochemical treatment of sewage effluents?

Oxidation
Dehydration
Fermentation
Reduction

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Environmental Engineering in CE
Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to

Reynold stresses
Neither A nor B
Shear forces
Both A & B

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Environmental Engineering in CE
The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.

105
90
120
60

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

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

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Environmental Engineering in CE
Presence of iron and manganese in water causes

Reduction in its dissolved oxygen content
None of these
Temporary hardness
Discoloration of bathroom fixtures

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Environmental Engineering in CE
Which of the following is not a weightless pollutant?

Radioactive rays
Thermal pollution
SPM
Noise pollution

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