Civil Engineering - Water Supply Engineering

31. 

Hard water contains

A. calcium
B. magnesium bicarbonates
C. magnesium sulphate
D. all the above.

Answer: Option D

Explanation:

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32. 

The main disadvantage of hard water, is

A. greater soap consumption
B. scaling of boilers
C. corrosion and incrustation of pipes
D. making food tasteless
E. all the above.

Answer: Option E

Explanation:

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33. 

An area is declared drought affected if its mean rainfall is less than

A. 50%
B. 60%
C. 75%
D. 80%
E. 85%.

Answer: Option E

Explanation:

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34. 

The best quality of filter material is obtained from quartzite if it does not loose weight when placed in hydro-chloric acid for 24 hours, more than

A. 5%
B. 8%
C. 10%
D. 12%
E. 15%.

Answer: Option A

Explanation:

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35. 

If discharge of a pump is 0.16 cumecs, the economic diameter of pipe, is

A. 0.488 m
B. 4.88 cm
C. 0.488 cm
D. 4.88 m
E. none of these.

Answer: Option A

Explanation:

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