Civil Engineering - Waste Water Engineering

16. 

If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is

A. 2 hours
B. 3 hours
C. 4 hours
D. 5 hours.

Answer: Option C

Explanation:

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17. 

An inverted siphon is designed generally for

A. one pipe
B. two pipes
C. three pipes
D. four pipes.

Answer: Option C

Explanation:

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18. 

A rainfall may be classified as acidic if its pH value is less or equal to

A. 6
B. 7
C. 5
D. 6.5

Answer: Option C

Explanation:

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19. 

When drainage to sewage ratio is 20, the peak dry weather flow is

A. 20% of the design discharge
B. slightly less than 5% of the design discharge
C. slightly more than 5% of the design discharge
D. none of these.

Answer: Option B

Explanation:

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20. 

For treating the sewage of a large city, you will recommend

A. a sedimentation tank and an activated sludge treatment plant
B. a plant consisting of Imhoff tanks with low rate trickling filters
C. sedimentation tanks with high rate trickling filters
D. none of these.

Answer: Option A

Explanation:

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