Civil Engineering - Waste Water Engineering

41. 

For large sewers, maximum distance between manholes may be

A. 50 m
B. 100 m
C. 200 m
D. 300 m
E. 400 m.

Answer: Option D

Explanation:

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42. 

The first stage of neutral process of sludge digestion, is

A. acid fermentation
B. acid regression
C. alkaline fermentation
D. none of these.

Answer: Option A

Explanation:

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43. 

Lead acetate test in sewer manhole is done to test the presence of

A. Methane gas
B. Hydrogen sulphide
C. Carbondioxide gas
D. Diesel vapours.

Answer: Option B

Explanation:

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44. 

Dried sewage after treatment is used as

A. fertilizer
B. building material
C. chemical for lowering B.O.D.
D. base material for paints.

Answer: Option A

Explanation:

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45. 

The use of coarse screens for the disposal of sewage, may be dispensed with by

A. comminutor
B. shredder
C. both (a) and (b)
D. neither (a) nor (b).

Answer: Option C

Explanation:

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