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Environmental Engineering in CE

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

1
25
0.1
5

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Environmental Engineering in CE
Fine grit present in sewage is removed in the __________ during sewage treatment.

Grit chamber
Detritus tank
Trickling filter
Skimming tank

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Environmental Engineering in CE
The Killer gas which caused Bhopal gas tragedy in 1984 was

Carbon monoxide
Methyl iso-cynate (MIC)
Sulphur dioxide
Phosgene

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Environmental Engineering in CE
BOD of raw municipal sewage may be in the range of about __________ mg/litre.

2000-3000
5-10
150-300
1-2

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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.

70
30
100
3

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Environmental Engineering in CE
Presence of high concentration of ozone and smog in atmospheric air causes the

Fading of dye on textiles
Cracking of rubber products
Embrittlement & decrease of folding resistance of paper
Damage of electrical insulator on high tension power line

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