Civil Engineering - Waste Water Engineering

16. 

Stone ware pipes are

A. highly resistant to sulphide corrosion
B. highly impervious
C. hydraulically efficient because of their smooth interior surface
D. specially suited to pressure pipes
E. none of these.

Answer: Option D

Explanation:

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17. 

Skimming tanks are

A. used to remove the grease and oil
B. those from which sludge is skimmed out
C. tanks provided with self-cleansing screens
D. improved version of grit chambers.

Answer: Option A

Explanation:

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18. 

In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is

A.
B.
C.
D.

Answer: Option C

Explanation:

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19. 

Assertion (A) : The determination of pH value of sewerage is important.

Reason (R) : The efficiency of certain treatment methods depends upon the availability of pH value.

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true.

Answer: Option A

Explanation:

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20. 

With self cleansing velocity in sewers

A. silting occurs at bottom
B. scouring occurs at bottom
C. both silting and scouring occur at bottom
D. neither silting nor scouring occurs at bottom.

Answer: Option D

Explanation:

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