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Water Supply Engineering

Water Supply Engineering
The least thickness of class B cast iron (spun) pipe, is

10 mm
8.6 mm
7.9 mm
7.2 mm

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Water Supply Engineering
Corrosion of well pipes may not be reduced by

reducing the flow velocity
reducing the draw down and the pumping rate
using screens having larger area of openings
using thicker pipes

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Water Supply Engineering
To pump water from a water reservoir 3 m deep and maximum water level at 135 m, a pump is installed to lift water up to R.L. 175 m at a constant rate of 36,00,000 litres per hour. If the length of the pipe is 1506 m and f = 0.01, ignoring other minor losses and assuming the economical diameter from Lea's formula D = 1.2 √Q, the water horse power of the pump is

500
400
600
450

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Water Supply Engineering
Specific capacity or yield of wells, is generally expressed, as

m³/hour
m³/hour/m²
m³/sec
m³/hour/m²/m

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Water Supply Engineering
In slow sland filters, the turbidity of raw water can be removed only up to

75 mg/litre
100 gm/litre
60 mg/litre
150 mg/litre

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Water Supply Engineering
For the prediction of future population of a city, the factor to be considered, is

All listed here
Deaths
Births
Migrants

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