Civil Engineering - Water Supply Engineering

21. 

In pumping stations, the type of joint generally used, is

A. socket and spigot joint
B. flanged joint
C. expansion joint
D. dresser coupling joint
E. flexible joint.

Answer: Option B

Explanation:

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22. 

The permissible pH value for public water supplies may range between

A. 4.5 to 5.5
B. 5.5 to 6.5
C. 6.5 to 8.5
D. 8.5 to 10.5
E. none of these.

Answer: Option C

Explanation:

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23. 

The strainer type tube well, is unsuitable for

A. coarse gravels
B. fine sandy strata
C. clean gravels
D. none of these.

Answer: Option B

Explanation:

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24. 

Pick up the correct statement from the following :

A. Lime may be used to soften the hard water
B. Excessive use of lime may kill the bacterias
C. Excessive lime when added to water, raises its pH value
D. When lime raises pH value of water to about 9.5, 100% bacterias are removed
E. All the above.

Answer: Option E

Explanation:

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25. 

Specific capacity or yield of wells, is generally expressed, as

A. m3 per sec
B. m3/hour
C. m3/hour/m2
D. m3/hour/m2/m
E. m3/hour/m2/sec.

Answer: Option D

Explanation:

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