Civil Engineering - Water Supply Engineering

1. 

The most commonly used chemical for dechlorination of water, is

A. sodium thiosulphate
B. sodium bisulphate
C. sodium sulphite
D. sulphur-dioxide
E. all the above.

Answer: Option C

Explanation:

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2. 

The prescribed hardness limit of potable water ranges between

A. 50 to 75 P.P.M.
B. 75 to 115 P.P.M.
C. 100 to 150 P.P.M.
D. 150 to 200 P.P.M.
E. none of these.

Answer: Option B

Explanation:

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3. 

For centrifugal pumps

A. initial cost is low
B. limited space is required
C. the discharge obtained is steady and non-pulsating
D. all the above.

Answer: Option D

Explanation:

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4. 

The cast iron pipes for water supply system are used for

A. durability
B. strength
C. easy connection
D. low maintenance cost
E. all the above.

Answer: Option E

Explanation:

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5. 

For plain chlorination of water, the quantity of chlorine used, is

A. 0.1 mg/litre
B. 0.2 mg/litre
C. 0.3 mg/litre
D. 0.4 mg/litre
E. 0.5 mg/litre.

Answer: Option E

Explanation:

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