Civil Engineering - Waste Water Engineering

6. 

The digested sludge from septic tanks, is removed after a maximum period of

A. 3 years
B. 3.5 years
C. 4 years
D. 5 years.

Answer: Option A

Explanation:

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7. 

For providing an Indian type W.C., the R.C.C. slabs in the toilet portion

A. should be sunk by 20 cm
B. should be kept 20 cm above the adjacent portion
C. should be sunk by 50 cm
D. need not be sunk.

Answer: Option C

Explanation:

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8. 

The gradient of sewers depends upon

A. velocity of flow
B. diameter of the sewer
C. discharge
D. all the above.

Answer: Option D

Explanation:

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9. 

The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is

A. 30 minutes
B. 1 hour
C. 1 hour and 30 minutes
D. 2 hours
E. 3 hours.

Answer: Option D

Explanation:

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10. 

The drop man holes are generally provided in sewers for

A. industrial areas
B. large town ships
C. hilly town ships
D. cities in plains.

Answer: Option C

Explanation:

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