Civil Engineering - Waste Water Engineering

21. 

Aerobic activity is maximum

A. in freshly produced sewage
B. at sewer pipes
C. in sewer treatment plants
D. none of these.

Answer: Option A

Explanation:

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22. 

In sewers designed with self cleansing velocity,

A. the bottom is silted
B. the bottom is scoured
C. both silting and scouring occur at the bottom
D. neither silting nor scouring occurs at the bottom.

Answer: Option D

Explanation:

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23. 

Which one of the following resists hydrogen sulphide corrosion

A. R.C.C.
B. Glazed stone wares
C. Asbestos cement
D. Glazed ware.

Answer: Option D

Explanation:

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24. 

The sewerage system consists of

A. house sewer
B. lateral sewer
C. branch sewer
D. main sewer
E. all of these.

Answer: Option E

Explanation:

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25. 

Hume steel pipes are

A. steel pipes
B. R.C.C. pipes
C. steel shell coated from inside with cement mortar
D. steel shell coated from outside with cement mortar
E. both (c) and (d).

Answer: Option E

Explanation:

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