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Environmental Engineering in CE

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?

H₂
N₂
CO₂
SO₃

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Environmental Engineering in CE
In a sedimentation tank, the detention period for water ranges from __________ hours.

8 to 12
16 to 20
2 to 4
24 to 32

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Environmental Engineering in CE
Scale formation in boiler is controlled by

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

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

Radioactive rays
SPM
Thermal pollution
Noise pollution

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Environmental Engineering in CE
BOD of raw municipal sewage may be in the range of about __________ mg/litre.

2000-3000
150-300
1-2
5-10

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Environmental Engineering in CE
Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan

Neither A nor B
Both A & B
Of increased diameter
With greater number of blades

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