Civil Engineering - Water Supply Engineering

16. 

Pick up the wrong nominal internal diameter of cast iron (spun) pipes in mm from the following :

A. 300
B. 400
C. 500
D. 550
E. 600

Answer: Option D

Explanation:

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17. 

Hardness of water can be removed by boiling if it is due to

A. calcium bicarbonates
B. calcium sulphates
C. calcium chloride
D. calcium nitrates.

Answer: Option A

Explanation:

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18. 

A well is considered to be good if it is sunk into

A. Clay
B. Sand
C. Coarse gravel
D. Silt.

Answer: Option C

Explanation:

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19. 

The nitrate concentration in domestic water supplies, is generally limited to

A. 10 ppm
B. 15 ppm
C. 25 ppm
D. 30 ppm
E. 45 ppm.

Answer: Option E

Explanation:

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20. 

Sluice valves in main water supplies

A. are used to regulate the flow of water in pipes
B. are spaced about 5 km apart
C. are usually placed at the summits
D. all the above.

Answer: Option D

Explanation:

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