Civil Engineering - Waste Water Engineering

6. 

In normal conditions, the period for sludge digestion, is

A. 10 days
B. 20 days
C. 30 days
D. 60 days
E. 90 days.

Answer: Option C

Explanation:

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7. 

The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope

A. 1 in 5
B. 1 in 10
C. 1 in 15
D. 1 in 20
E. 1 in 25

Answer: Option B

Explanation:

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8. 

For a continuous flow type of sedimentation tanks

A. width of the tank is normally kept about 6 m
B. length of the tank is normally kept 4 to 5 times the width
C. maximum horizontal flow velocity is limited to 0.3 m/minute
D. capacity of the tank for 24 hours, is kept equal to maximum daily flow of sewage
E. all the above.

Answer: Option E

Explanation:

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9. 

The temperature affects the

A. biological activity of bacterias in sewage
B. solubility of gases in sewage
C. viscosity of sewage
D. all the above.

Answer: Option D

Explanation:

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10. 

Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is

A. centrifugal pump
B. pneumatic ejector
C. reciprocating pump
D. none of these.

Answer: Option A

Explanation:

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