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Environmental Engineering in CE

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

5-10
1500-2500
1-2
90-120

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

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

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Environmental Engineering in CE
Tri-sodium phosphate is used in boiler water treatment to reduce

Turbidity
Caustic embrittlement
Suspended silica
Dissolved oxygen

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Environmental Engineering in CE
World's worst radioactive pollution was caused by nuclear reactor disaster which occured in

Chernobyl (undivided U.S.S.R.)
Arizona (U.S.A.)
Pensylvania (U.S.A.)
Moscow (U.S.S.R.)

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Environmental Engineering in CE
Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants?

SO₂
Hg
NOx
F

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Environmental Engineering in CE
Presence of __________ bacteria in water causes disease like typhoid.

Pathogenic
Non-pathogenic
Anaerobic
Aerobic

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