Civil Engineering - Waste Water Engineering

11. 

Sewer ventilating columns are generally placed at

A. distances 150 m to 300 m
B. upper ends of branch sewers
C. every change in the size of sewers
D. all the above.

Answer: Option D

Explanation:

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12. 

In case of Imhoff tanks,

A. the shape is rectangular
B. detention period is 2 hours
C. the velocity of flow is restricted to 0.30 m/minute
D. surface loading is limited to 30, 000 litres/m of plan area per day
E. All the above.

Answer: Option E

Explanation:

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13. 

If the depth of partial flow in a sewer of diameter 2 m, is 50 cm, its wetted perimeter is

A. π
B.
C.
D.
E.

Answer: Option D

Explanation:

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14. 

A drop manhole is provided if

A. a sewer drops from a height
B. a branch sewer joins the main sewer at higher level
C. a lamp is inserted to check obstruction
D. none of these.

Answer: Option B

Explanation:

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15. 

In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is

A. 5
B. 10
C. 15
D. 20

Answer: Option D

Explanation:

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