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Environmental Engineering in CE

Environmental Engineering in CE
TLV of NO₂ & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO₂ causes

Skin disorder
Bronchitis
Bone disease
Cancer

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Environmental Engineering in CE
Corrosion in boilers can be prevented by

Enhancing pH of feed water by adding alkali
All of these
Deaeration of feed water
Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion

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

CO
NOx
Hydrocarbons
SO₂

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Environmental Engineering in CE
Fresh domestic sewage is __________ in color.

Grey
Red
Dark brown
Black

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Environmental Engineering in CE
The biological decomposition of organic substances in wastes controlled conditions is called

Composting
Biological oxidation
Incineration
None of these

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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

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

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