Civil Engineering - Water Supply Engineering

36. 

Hard water for public water supply is discarded because

A. it consumes more soap
B. it contains lot of turbidity
C. it contains pathogenic bacterias
D. it possesses bad taste and odour
E. none of these.

Answer: Option A

Explanation:

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37. 

Pick up the correct statement from the following regarding radial flow centrifugal pumps :

A. These are provided with volute type or turbine type casings
B. In involute type of radial flow centrifugal pump, the impeller discharges into a gradually expanding spiral casing
C. In turbine type of radial flow centrifugal pumps, the impeller is surrounded by stationary guide vanes to reduce the velocity of water
D. The efficiency of turbine type of radial flow centrifugal pump, is always higher than that of volute type
E. All the above.

Answer: Option E

Explanation:

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38. 

Quality of water is said to be good if it is

A. free from suspended matter
B. colourless
C. free from pathogenic organism
D. tasteless
E. all the above.

Answer: Option E

Explanation:

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39. 

Pick up the incorrect statement from the following :

A. An impervious layer a few metres below the water table in the sub-soil, is generally called Mota layer (6) Mota layer is very useful to give structural support to open deep wells
B. A bore hole is generally provided in the mota layer for deep wells
C. Shallow wells are always of less depth as compared to deep wells
D. None of these.

Answer: Option D

Explanation:

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40. 

The main draw-back of centrifugal pump, is

A. necessity of priming
B. discharge from pump varies with the load of water
C. for high heads, efficiency is low up to 50%
D. the suction lift is limited to 6 m
E. all the above.

Answer: Option E

Explanation:

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