Civil Engineering - Waste Water Engineering

46. 

rd or th extra space is left in sewer pipes at maximum discharge for

A. low estimates of the average and maximum flows
B. large scale infiltration of storm water
C. unexpected increase in population
D. all the above.

Answer: Option D

Explanation:

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47. 

If n is the rugosity coefficient, r is the hydraulic depth, s is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula evolved by

A. Chezy
B. Manning
C. Bazin
D. Kutter.

Answer: Option B

Explanation:

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48. 

Pick up the correct statement from the following :

A. anaerobic bacteria flourish in the absence of oxygen
B. aerobic bacteria flourish in the presence of oxygen
C. facultative bacteria flourish with or without oxygen
D. all the above.

Answer: Option D

Explanation:

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49. 

Antisyphonage pipe is fitted

A. at the end of septic tanks
B. on manholes
C. with a W.C. trap
D. at the beginning of sewer line.

Answer: Option C

Explanation:

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50. 

For drains up to 15 cumecs, the depth d and width B are related by

A. d = 0.2 B
B. d = 0.5 B
C. B = 0.2 d
D. B = 0.5 d.

Answer: Option B

Explanation:

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