Civil Engineering - Waste Water Engineering

31. 

Dilution method of disposing off sewage, is not preferred to

A. when sewage is fresh
B. when diluting water has high dissolved oxygen content
C. when diluting water is used for water supply near the point of sewage disposed
D. when the diluting water is having flow currents
E. none of these.

Answer: Option C

Explanation:

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32. 

For house drainage minimum gradient is

A. 1 in 60
B. 1 in 80
C. 1 in 10
D. 1 in 400

Answer: Option A

Explanation:

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33. 

If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is

A. 1045 mm
B. 1065 mm
C. 1075 mm
D. 1095 mm.

Answer: Option D

Explanation:

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34. 

The ratio of minimum hourly flow to the average flow of sewage is

A. 1/4
B. 1/3
C. 1/2
D. 3/4

Answer: Option B

Explanation:

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35. 

Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to

A. initial demand
B. first stage demand
C. carbonaceous demand
D. all of these.

Answer: Option D

Explanation:

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