Civil Engineering - Waste Water Engineering

31. 

Fresh sewage may become stale in

A. one hour
B. two to three hours
C. three to four hours
D. six hours.
E. ten hours.

Answer: Option C

Explanation:

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32. 

The small sewers are cleaned by

A. flushing
B. cane rodding
C. wooden pills
D. none of these.

Answer: Option A

Explanation:

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33. 

Dry water flow in a combined sewer, is

A. industrial sewage
B. domestic sewage
C. storm water
D. inclusive of domestic and industrial sewage but excludes storm water.

Answer: Option D

Explanation:

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34. 

Which one of the following tests is used for testing sewer pipes :

A. water test
B. ball test
C. mirror test
D. all of these.

Answer: Option D

Explanation:

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35. 

Nitrogen cycle of sewage, is

A. Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen
B. Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates
C. Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia
D. Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates
E. None of these.

Answer: Option A

Explanation:

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