Civil Engineering - Waste Water Engineering

21. 

The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is

A.
B.
C.
D.

Answer: Option A

Explanation:

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22. 

The dimensions of a rectangular settling tank are : length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is

A. 204 cu m
B. 208 cu m
C. 212 cu m
D. 216 cu m
E. 220 cu m.

Answer: Option D

Explanation:

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23. 

The screens are fixed

A. perpendicular to the direction of flow
B. parallel to the direction of flow
C. at an angle 30° to 60° to the direction of flow
D. none of these.

Answer: Option C

Explanation:

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24. 

In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is

A. 2.25
B. 2.50
C. 2.55
D. 2.65
E. 2.75

Answer: Option D

Explanation:

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25. 

Pick up the in-correct statement from the following :

A. Manholes are provided in sewer pipes at suitable intervals
B. Catch basins are generally provided in sewers for carrying drainage discharge
C. Inlets are generally provided in all sewers
D. None of these.

Answer: Option C

Explanation:

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