Civil Engineering :: Water Supply Engineering
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The main disadvantage of hard water, is
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An area is declared drought affected if its mean rainfall is less than
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The best quality of filter material is obtained from quartzite if it does not loose weight when placed in hydro-chloric acid for 24 hours, more than
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If discharge of a pump is 0.16 cumecs, the economic diameter of pipe, is
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Hard water for public water supply is discarded because
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Pick up the correct statement from the following regarding radial flow centrifugal pumps :
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Quality of water is said to be good if it is
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Pick up the incorrect statement from the following :
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The main draw-back of centrifugal pump, is
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A.
These are provided with volute type or turbine type casings
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B.
In involute type of radial flow centrifugal pump, the impeller discharges into a gradually expanding spiral casing
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C.
In turbine type of radial flow centrifugal pumps, the impeller is surrounded by stationary guide vanes to reduce the velocity of water
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D.
The efficiency of turbine type of radial flow centrifugal pump, is always higher than that of volute type
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E.
All the above.
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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
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B.
A bore hole is generally provided in the mota layer for deep wells
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C.
Shallow wells are always of less depth as compared to deep wells
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D.
None of these.
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