Civil Engineering - Waste Water Engineering

26. 

The rainfall at any place may be determined by

A. its intensity
B. its direction
C. its frequency
D. all the above.

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

27. 

In trickling filter, B.O.D. is reduced to

A. 30 to 40%
B. 40 to 60%
C. 60 to 80%
D. 80 to 90%
E. 95%.

Answer: Option C

Explanation:

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28. 

Which one of the following gases is most significant as air pollutant

A. Carbondioxide
B. Oxygen
C. Nitrogen
D. Sulphurdioxide.

Answer: Option D

Explanation:

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29. 

Which one of the following statements regarding septic tanks is wrong :

A. a gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided
B. the outlet invert level is kept 5 to 7.5 cm below the inlet invert level
C. the minimum width of septic level is 90 cm
D. the depth of tank is kept equal to its width.

Answer: Option D

Explanation:

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30. 

In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,

A. is only provided
B. is doubled
C. is trebled
D. is not enough.

Answer: Option B

Explanation:

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