Civil Engineering - Waste Water Engineering

36. 

The settlement of a particle in sedimentation tank, is affected by

A. velocity of flow
B. viscosity of water
C. size and shape of solid
D. specific gravity of solid
E. all the above.

Answer: Option E

Explanation:

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37. 

If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is

A. 2 hours
B. 4 hours
C. 6 hours
D. 8 hours.

Answer: Option D

Explanation:

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38. 

Oxidation process results in the formation of

A. carbon dioxide
B. nitrates
C. sulphates
D. all the above.

Answer: Option D

Explanation:

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39. 

Dry weather flow is :

A. average daily rate of flow
B. average monthly rate of flow
C. average annual rate of flow
D. water supply allowance per capita
E. none of these.

Answer: Option D

Explanation:

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40. 

As compared to fresh river water, sea water contains oxygen

A. 10% less
B. 20% less
C. 10% more
D. 20% more.

Answer: Option B

Explanation:

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