WATER SUPPLY ENGINEERING QUIZ

As per IS : 1172-1963, water required per head per day for average domestic purposes, is

85 litres

105 litres

135 litres

65 litres

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Pick up the incorrect statement from the following. The underground sources of water, is from

infiltration wells

springs

storage reservoirs

wells

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Surcharge storage zone of a reservoir, is

Below dead storage

Above useful storage

Between dead storage and useful storage

Also known as valley storage

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Acidity in water is caused due to

All the above.

Mineral acids

Aluminium sulphate

Free CO₂

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

8.6 mm

7.2 mm

10 mm

7.9 mm

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In centrifugal pump installation,

The motor may burn out if it is started with empty delivery pipe and with open gate valve

Pump is properly primed before starting

All listed here

The diameter of the pipe at inlet as well as at outlet, is kept smaller than the delivery pipe

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For determining the velocity of flow of underground water, the most commonly used non-empirical formula is

Lacy’s formula

Slichter’s formula

Darcy’s formula

Hazen’s formula

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Average annual rainfall at any station is the average of annual rainfall over a period of

28 years

14 years

21 years

35 years

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

150 mg/litre

100 gm/litre

60 mg/litre

75 mg/litre

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Surge tanks are used

to increase the velocity in a pipeline

for storage water

as overflow valves

to guard against water hammer

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