Civil Engineering - Water Supply Engineering

31. 

Gravity conduits

A. carry water under gravity
B. follow the hydraulic gradient line
C. are carried on trestles in valleys and depressions
D. are carried through tunnels in deep cuttings
E. All the above.

Answer: Option E

Explanation:

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32. 

Carbonates in water produce

A. temporary hardness
B. permanent hardness
C. acidity
D. alkanity.

Answer: Option A

Explanation:

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33. 

Hardness of water is caused by

A. presence of soap lather
B. presence of chlorides and sulphates of sodium and potassium
C. presence of bicarbonates, sulphates or chlorides of calcium and magnesium
D. turbidity.

Answer: Option C

Explanation:

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34. 

A slow sand filter is cleaned if its filter head is higher than

A. 10 cm to 20 cm
B. 20 cm to 40 cm
C. 40 cm to 70 cm
D. 70 cm to 120 cm
E. 120 cm to 150 cm.

Answer: Option D

Explanation:

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35. 

A strainer type well sunk through three pervious layers intervened by three impervious aquicludes, draws water from

A. top most pervious layer
B. central pervious layer
C. lowest pervious layer
D. all the pervious layers.

Answer: Option D

Explanation:

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