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Environmental Engineering in CE

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

Inorganic
Fatty
Organic
Dissolved

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Environmental Engineering in CE
Exposure to SO₂ containing chimney gases results in the

Increased drying & hardening time of paints
All of these
Reduction in strength of leather & cloth
Acceleration of corrosion rates of metals

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Environmental Engineering in CE
Corrosion in boilers can be prevented by

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

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Environmental Engineering in CE
The permissible color for domestic water supply is __________ ppm.

100
1000
1
20

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Environmental Engineering in CE
Green house gases blanket/block the infrared radiation from earth's surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect?

CO₂
SO₃
H₂
N₂

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Environmental Engineering in CE
TLV of aldrin in public water supply system is about __________ μg/litre.

1097
357
17
0.5

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