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Environmental Engineering in CE

Environmental Engineering in CE
The concentration of water vapour in troposphere, which depends upon the altitude & temperature varies in the range of zero to __________ percent.

4
8
12
1

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Environmental Engineering in CE
Scale formation in boiler is controlled by

Reduction in hardness, silica & alumina in feed water
Eliminating H₂S in feed water
Preheating of feed water
Keeping the pH value of feed water just below 7

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Environmental Engineering in CE
Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by

Photosynthetic action of algae
Natural aeration of water stream
Both A & B
Neither A nor B

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Environmental Engineering in CE
Persons working in cement plants and limestone quarries are more prone to disease like

Cancer
Flourosis (bone disease)
Asthma
Silicosis

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Environmental Engineering in CE
Which of the following fine dust removal equipments is the most efficient?

Scrubber
Bag filter
Cyclone separator
Electrostatic precipitator

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Environmental Engineering in CE
Beyond what concentration of H₂S in air, acute danger to human life exists?

50 ppm
100 ppm
300 ppm
700 ppm

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