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Environmental Engineering in CE

Environmental Engineering in CE
Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).

4.8
0.002
0.2
1.2

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Environmental Engineering in CE
Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of __________ present in it.

Ortho-xylene
Potassium cyanide
Coal ash
None of these

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Environmental Engineering in CE
Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (μ g)/litre.

2
42
332
1050

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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

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

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Environmental Engineering in CE
Which is a secondary air pollutant?

Sulphur dioxide
Photochemical smog
Nitrogen dioxide
Dust particles

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Environmental Engineering in CE
Foul odour and bad taste of water is removed by treating with

Alum
Copper sulphate
Bleaching powder
Activated carbon

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MORE MCQ ON Environmental Engineering in CE

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