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Environmental Engineering in CE

Environmental Engineering in CE
Death may occur, when SO₂ concentration in atmospheric air exceeds __________ ppm.

400
20
200
100

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Environmental Engineering in CE
Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyl and haemoglobin breakdown of some animals, beyond TLV (>50 ppm)

Causes asphyxia
Causes increase in sea level
Acts as a green house gas thereby raising earth's temperature
Inhances the green house effect

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Environmental Engineering in CE
Water effluent generated in printing industry is decolourised by

Electrolytic decomposition
Adsorption
Reverse osmosis
Ion exchange technique

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Environmental Engineering in CE
The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is

Cavitation
Boundary layer separation
Pipe vibrations
Fluctuation in liquid flow

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Environmental Engineering in CE
Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.

Nitrogen dioxide
Hydrocarbons
Hydrogen sulphides
Hydrogen flouride

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Environmental Engineering in CE
Noise level during normal conversation among men is about __________ decibles.

10
90
115
45

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