Civil Engineering - Waste Water Engineering

6. 

The formula used for determining flow velocities in sewers, is known as

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

Answer: Option D

Explanation:

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7. 

The sewage treatment units in which anaerobic decomposition of organic matter is used, are called

A. imhoff tanks
B. trickling filters
C. sludge sedimentation tanks
D. none of these.

Answer: Option B

Explanation:

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8. 

The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be

A. 0.9 cm
B. 1.2 m
C. 1.5 m
D. > 1.5 m.

Answer: Option D

Explanation:

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9. 

The most efficient cross section of sewers in a separate sewerage system is

A. parabolic
B. circular
C. rectangular
D. new egged.

Answer: Option B

Explanation:

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10. 

If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is

A. 100 mg/l
B. 200 mg/l
C. 300 mg/l
D. 400 mg/l.

Answer: Option D

Explanation:

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