Civil Engineering - Waste Water Engineering

46. 

Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for

A. unexpected large scale infiltration of stream water
B. unexpected increase in the population
C. under estimates of maximum and average flows
D. All of the above.

Answer: Option D

Explanation:

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47. 

5 days-biochemical oxygen demand (BOD5) is taken at a temperature of

A. 0°C
B. 15°C
C. 20°C
D. 25°C.

Answer: Option C

Explanation:

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48. 

Water content of sewage is about

A. 90%
B. 95%
C. 99.9%
D. 9.9%.

Answer: Option C

Explanation:

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49. 

Imhoff cone is used to measure

A. total organic solids
B. total solids
C. total in organic solids
D. settleable solids.

Answer: Option D

Explanation:

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50. 

For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is

A. 16 m
B. 20 m
C. 24 m
D. 30 m.

Answer: Option C

Explanation:

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