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Environmental Engineering in CE

Environmental Engineering in CE
Noise pollution level in a chemical plant is expressed in

Hertz
Roentgen
None of these
Decibel

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

CO
N₂
CH₄
CO₂

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Environmental Engineering in CE
The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU).

1500
750
20
230

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Environmental Engineering in CE
Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called

Powder
Smoke
Grit
Dust

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Environmental Engineering in CE
Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).

Very extremely
Extremely
Moderately
Highly

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Environmental Engineering in CE
Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal

By chemical coagulation
In sedimentation tanks equipped with mechanical scrapper
In vacuum filter
In clarifiers

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