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Environmental Engineering in CE

Environmental Engineering in CE
Hazardous/polluting chemical industries should have an 'exclusion zone' with a green belt and general public access prohibited around it, covering a radius of ____ metres.

1000
400
100
4000

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Environmental Engineering in CE
Oil and grease present in an emulsified state in waste water discharged from industries can be removed by

Biological oxidation
Chlorination
Skimming off
Settling out using chemical reagents

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Environmental Engineering in CE
'Particulate' air pollutants are finely divided solids and liquids. Which of the following is not a 'particulate'?

None of these
Photochemical smog & soot
Smoke & fumes
Dust & mists

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Environmental Engineering in CE
The principal gas evolved from sludge digestion tank is

CH₄
CO₂
CO
N₂

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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.

0.05
15
6.5
1

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Environmental Engineering in CE
In large thermal power stations very fine particulates present in flue gas are removed by

Dust catcher
Bag filter
Wet scrubber
Electrostatic precipitators

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