Civil Engineering - Waste Water Engineering

31. 

Discrete or granular particles change their

A. size
B. shape
C. weight
D. none of these.

Answer: Option D

Explanation:

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32. 

For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is

A. 10 cm
B. 12 cm
C. 15 cm
D. 18 cm
E. 20 cm.

Answer: Option C

Explanation:

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33. 

For design of sewers, percentage of sewage discharge is assumed

A. 65 to 70%
B. 70 to 75%
C. 75 to 80%
D. 85%.

Answer: Option C

Explanation:

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34. 

In case of sewer lines

A. water test is carried out to check water tightness of the joints
B. test for straightness is carried out with the help of a lamp and mirror
C. obstruction test is carried out with the. help of smooth ball of diameter 13 mm
D. all the above.

Answer: Option D

Explanation:

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35. 

The sewerage system originates from

A. house sewers
B. lateral sewers
C. branch sewers
D. main sewers
E. out fall sewers.

Answer: Option A

Explanation:

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