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Environmental Engineering in CE

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

1
0.1
25
5

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Environmental Engineering in CE
Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters?

I-131
Ra-226
Au-198
Sr-90

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Environmental Engineering in CE
Noise pollution level in a chemical plant is expressed in

Decibel
Hertz
Roentgen
None of these

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Environmental Engineering in CE
Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause

Explosion
Non biodegradable foam
Undesirable plant growth
Corrosion

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

650
25
150
1

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Environmental Engineering in CE
Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by

Lagoons
Biological oxygen pond
Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)
Filtration

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