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Environmental Engineering in CE

Environmental Engineering in CE
TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.

5
100
2000
1000

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Environmental Engineering in CE
The disinfection efficiency of chlorine increases by(i) Decreasing the time of contact(ii) Decreasing the temperature of water(iii) Increasing the temperature of water

Both (i) and (ii)
Both (i) and (iii)
Only (iii)
Only (i)

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

CO₂
N₂
CH₄
CO

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Environmental Engineering in CE
Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO₂ in air is __________ ppm.

1000
5
500
2000

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Environmental Engineering in CE
Photochemical smog is formed from automobile exhaust

All of these
Is harmful for crops and trees also besides causing eye irritation & asthma
Appears only on sunny days
By reaction of hydrocarbon & nitric oxide in presence of sunlight

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Environmental Engineering in CE
Out of the following, TLV of __________ is the minimum (about 0.02 ppm).

MIC (methyl iso-cynate)
Phosgene
Bromine
Ozone

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