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Environmental Engineering in CE

Environmental Engineering in CE
Fine grit present in sewage is removed in the __________ during sewage treatment.

Grit chamber
Skimming tank
Trickling filter
Detritus tank

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Environmental Engineering in CE
The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.

120
105
60
90

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Environmental Engineering in CE
Polyvinyl chloride containers are not suitable for storing

Foodstuffs
Metallic powder
Woolen clothes
None of these

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Environmental Engineering in CE
CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozones.

10¹⁵
10⁵
10²
10⁹

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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
Of increased diameter
Both A & B
With greater number of blades

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Environmental Engineering in CE
There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.

15
6.5
0.05
1

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