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Environmental Engineering in CE

Environmental Engineering in CE
Most of the atmospheric air pollutants are present in large quantity in

Trophosphere
Mesosphere
Stratosphere
Thermosphere

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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
Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.

Mercury
Lead
Arsenic
Fluoride

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Environmental Engineering in CE
Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by

None of these
Chemical coagulation
Treating in biological oxygen pond
Chlorination

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Environmental Engineering in CE
High noise level in a chemical plant can be controlled by the

All of these
Protection of operating personnel
Suppression of noise at the source itself
Path control of noise

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

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

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