Civil Engineering - Waste Water Engineering

11. 

Pick up the correct statement from the following :

A. In treated sewage, 4 PPm of D.O. is essential
B. Only very fresh sewage contains some dissolved oxygen
C. The solubility of oxygen in sewage is 95% that is in distilled water
D. All the above.

Answer: Option D

Explanation:

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12. 

In olden days the type of section adopted in trunk and out fall sewers was

A. parabolic shaped
B. horse shoe shaped
C. egg shaped
D. circular shaped.

Answer: Option B

Explanation:

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13. 

For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed

A. 3 PPm
B. 4 PPm
C. 5 PPm
D. 10 ppm.

Answer: Option B

Explanation:

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14. 

In a fully mechanised composting plant, involves

A. mechanized receipt
B. mechanized segregation
C. mechanized pulverising of refuse
D. all of these.

Answer: Option D

Explanation:

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15. 

Self-cleansing velocity is

A. velocity at dry weather flow
B. velocity of water at flushing
C. velocity at which no accumulation remains in the drains
D. velocity of water in a pressure filter.

Answer: Option C

Explanation:

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