Civil Engineering - Water Supply Engineering

41. 

Rapid sand filter

A. should be preceeded by coagulation and sedimentation
B. uses rapid sand as filter media
C. is used after slow sand filtering has been done
D. can combine disinfection also.

Answer: Option A

Explanation:

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42. 

Pick up the correct statement from the following :

A. Copper pipes are highly resistant to acidic and alkaline water
B. Wrought iron pipes are lighter than cast iron pipes
C. Wrought iron pipes corrode quickly and are less durable
D. Wrought iron pipes coated with zinc, are called galvanised iron pipes
E. All the above.

Answer: Option E

Explanation:

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43. 

Rapid gravity filters can remove bacterial impurities up to a maximum of

A. 50%
B. 60%
C. 70%
D. 80%
E. 90%.

Answer: Option D

Explanation:

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44. 

Cast iron pipes

A. are widely used in city water supplies
B. resist corrosion satisfactorily
C. may last for 100 years
D. are normally manufactured in lengths of about 3.5 m
E. all the above.

Answer: Option E

Explanation:

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45. 

Run off is the quantity of water which flows

A. in sewer pipes
B. due to leakage in pipes
C. in rivers
D. none of these.

Answer: Option C

Explanation:

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