Civil Engineering - Waste Water Engineering

6. 

The minimum diameter of a sewer is kept

A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm
E. 30 cm.

Answer: Option B

Explanation:

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7. 

The minimum diameter of sewer to be adopted is

A. 10 cm
B. 12.5 cm
C. 15 cm
D. 25 cm.

Answer: Option C

Explanation:

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8. 

To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by pottassium dichromate in the presence of

A. Hydrochloric acid
B. Sulphuric acid
C. Nitric acid
D. Citric acid.

Answer: Option B

Explanation:

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9. 

The discharge per unit plan area of a sedimentation tank, is generally called

A. over flow rate
B. surface loading
C. over flow velocity
D. all the above.

Answer: Option D

Explanation:

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10. 

In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is

A.
B.
C.
D.

Answer: Option D

Explanation:

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