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Environmental Engineering in CE

Environmental Engineering in CE
Dissolved oxygen content in river water is around __________ ppm.

5
100
500
250

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Environmental Engineering in CE
During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.

Both B and C
Digestion
Filtration
Sedimentation

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Environmental Engineering in CE
Scale formation in boiler is controlled by

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

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Environmental Engineering in CE
The disinfection efficiency of chlorine increases by(i) Decreasing the time of contact(ii) Decreasing the temperature of water(iii) Increasing the temperature of water

Both (i) and (ii)
Both (i) and (iii)
Only (iii)
Only (i)

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Environmental Engineering in CE
Solid content in most of the domestic sewage is about __________ percent.

5
0.1
10
0.001

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Environmental Engineering in CE
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.

Hydrogen
None of these
Ozone
Carbon dioxide

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