Civil Engineering - Waste Water Engineering

21. 

Lead caulked joints are used for laying

A. stone ware pipes
B. earthern ware pipes
C. C.I. pipes
D. G.I. pipes.

Answer: Option B

Explanation:

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22. 

Pick up the correct statement from the following :

A. The water supply pipes carry pure water free from solid particles
B. The water supply pipes get clogged if flow velocity is less than self cleansing velocity
C. The sewers may be carried up and down the hills and valleys
D. The sewer pipes are generally laid along level hills
E. None of these.

Answer: Option A

Explanation:

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23. 

For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed

A. 1.5
B. 2.0
C. 2.5
D. 3.0
E. 3.5

Answer: Option A

Explanation:

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24. 

At the junction of sewers

A. top of smaller sewer is kept lower
B. top of larger sewer is kept lower
C. tops of both the sewers are at the same level
D. none of these.

Answer: Option D

Explanation:

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25. 

Primary treatment of sewage consists of removal of

A. large suspended organic solids
B. oil and grease
C. sand and girt
D. floating materials
E. none of these.

Answer: Option A

Explanation:

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