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Civil Engineering - Water Supply Engineering

Exercise : Water Supply Engineering - Section 2
36.
Hard water for public water supply is discarded because
it consumes more soap
it contains lot of turbidity
it contains pathogenic bacterias
it possesses bad taste and odour
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
Pick up the correct statement from the following regarding radial flow centrifugal pumps :
These are provided with volute type or turbine type casings
In involute type of radial flow centrifugal pump, the impeller discharges into a gradually expanding spiral casing
In turbine type of radial flow centrifugal pumps, the impeller is surrounded by stationary guide vanes to reduce the velocity of water
The efficiency of turbine type of radial flow centrifugal pump, is always higher than that of volute type
All the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
Quality of water is said to be good if it is
free from suspended matter
colourless
free from pathogenic organism
tasteless
all the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
Pick up the incorrect statement from the following :
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
A bore hole is generally provided in the mota layer for deep wells
Shallow wells are always of less depth as compared to deep wells
None of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
The main draw-back of centrifugal pump, is
necessity of priming
discharge from pump varies with the load of water
for high heads, efficiency is low up to 50%
the suction lift is limited to 6 m
all the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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