Civil Engineering - Waste Water Engineering

36. 

In sewers the highest non-scouring velocity is achieved in

A. glazed bricks sewers
B. cast iron sewers
C. cement concrete sewers
D. stone ware sewers.

Answer: Option A

Explanation:

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37. 

In sewage having fully oxidised organic matter, the nitrogen exists in the form of

A. nitrites
B. nitrates
C. free ammonia
D. aluminoid nitrogen
E. none of these.

Answer: Option B

Explanation:

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38. 

It is customary to design a sewer for D.W.F. on the basis of

A. average demand
B. twice the average demand
C. thrice the average demand
D. four times the average demand.

Answer: Option C

Explanation:

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39. 

During preliminary treatment of a sewage

A. Oil and grease are removed from skimming tanks
B. Floating materials are removed by screening
C. Girt and sand are removed by girt chambers
D. All the above.

Answer: Option D

Explanation:

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40. 

Pick up the correct statement from the following :

A. The larger the sewer in size, more will be velocity
B. The smaller the sewer in size, less will be velocity
C. The larger the sewer in size, no deposition will take place
D. The larger the sewer in size, deposition will take place.

Answer: Option D

Explanation:

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