Civil Engineering - Waste Water Engineering

1. 

Sewer pipes need be checked for

A. minimum flow
B. maximum flow
C. both (a) and (b)
D. none of these.

Answer: Option C

Explanation:

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2. 

If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of

A. degradation
B. active decomposition
C. recovery
D. cleaner water
E. none of these.

Answer: Option B

Explanation:

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3. 

The ratio of design discharge to the surface area of a sedimentation tank is called

A. surface loading
B. overflow rate
C. overflow velocity
D. all of these.

Answer: Option D

Explanation:

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4. 

The value of Chezy's constant

is used in

A. Chezy's formula
B. Bazin's formula
C. Kutter's
D. Manning's formula.

Answer: Option C

Explanation:

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5. 

In the activated sludge process

A. aeration is continued till stability
B. aeration is done with an admixture of previously aerated sludge
C. sludge is activated by constant stirring
D. water is removed by centrifugal action.

Answer: Option B

Explanation:

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