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Environmental Engineering in CE

Environmental Engineering in CE
Green house gases blanket/block the infrared radiation from earth's surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect?

CO₂
N₂
SO₃
H₂

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Environmental Engineering in CE
Tolerable limit of nitrogen oxides in air is __________ ppm.

5
1
25
0.1

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Environmental Engineering in CE
TLV of lead for public sewer/waste water is about __________ ppm.

650
25
1
150

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Environmental Engineering in CE
Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about __________ decibels.

3
70
30
100

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Environmental Engineering in CE
Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm)?

Carbon monoxide
Sulphur dioxide
Peroxyacyl nitrate
Benzopyrene

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Environmental Engineering in CE
__________ is removed from water by lime-soda process.

Foul smell and taste
Permanent hardness
Temporary hardness
Iron and manganese

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