Civil Engineering - Waste Water Engineering

26. 

Clogging of sewers, is caused due to

A. silting
B. low discharge
C. greasy and oily matters
D. domestic wastes thrown in manholes
E. all the above.

Answer: Option E

Explanation:

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27. 

A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is

A. 0.30 m/sec
B. 0.35 m/sec
C. 0.40 m/sec
D. 0.45 m/sec
E. 0.50 m/sec.

Answer: Option D

Explanation:

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28. 

The coagulant widely used for sewage treatment, is

A. alum
B. ferric chloride
C. ferric sulphate
D. chlorinated copperas.

Answer: Option B

Explanation:

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29. 

House connections to the laterals is generally made by

A. R.C.C.
B. P.C.C.
C. Cast iron
D. Glazed stonewares.

Answer: Option D

Explanation:

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30. 

The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is

A. 1.5
B. 2.0
C. 3.0
D. 4.0

Answer: Option B

Explanation:

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