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Environmental Engineering in CE

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
500
5
2000

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Environmental Engineering in CE
Smog is

A solid particle e.g. flyash
Nothing but black smoke
A combination of smoke and fog
A liquid particle resulting from vapor condensation

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Environmental Engineering in CE
Exposure to small amount of __________ results in high blood pressure & heart disease in human beings.

Mercury
Asbestos
Cadmium
Hydrogen sulphide

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Environmental Engineering in CE
Ozone level is generally found to be depleted in India in the month of

July
February
April
December

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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

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

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Environmental Engineering in CE
Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.

120
50
25
80

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