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Environmental Engineering in CE

Environmental Engineering in CE
__________ plant emits large amount of SO₂ as an air pollutant.

Sulphuric acid
Iron & steel
Chloralkali
Nitric acid

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Environmental Engineering in CE
Corrosion in boilers can be prevented by

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

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Environmental Engineering in CE
Scale formation in boiler is controlled by

Eliminating H₂S in feed water
Reduction in hardness, silica & alumina in feed water
Preheating of feed water
Keeping the pH value of feed water just below 7

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Environmental Engineering in CE
The pH value of potable water should be between

4 to 5
1 to 1.5
6.5 to 8
13 to 14

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Environmental Engineering in CE
If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur.

500
3000 (i.e. 0.3%)
50
1000

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Environmental Engineering in CE
Which of the following plants does not emit appreciable amount of SO₂ in atmosphere?

Sulphuric acid plant
Petroleum refinery
Nitric acid plant
Thermal power plant

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