A. Kuichling’s formula
B. Freeman formula
C. Under Writers formula
D. Bustan’s formula
E. All the above.
0
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The yield of a rapid gravity filter as compared to that of slow sand filter, is__________________?
0
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Sunlight_________________ ?
A. 10 times
B. 15 times
C. 20 times
D. 30 times
E. 35 times
0
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Average annual rainfall at any station is the average of annual rainfall over a period of________________?
A. helps growth of bacterias
B. impedes growth of algae
C. increases dissolved oxygen content
D. reduces turbidity
0
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Surge tanks are used_______________?
A. 7 years
B. 14 years
C. 21 years
D. 28 years
E. 35 years
0
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Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be________________?
A. for storage water
B. to increase the velocity in a pipeline
C. as overflow valves
D. to guard against water hammer
0
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In distribution pipes, drain valves are provided at_______________?
A. nil
B. 5
C. 10
D. 15
E. 20
0
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Asbestos pipes are ______________?
A. lower point
B. higher point
C. junction points
D. any where
0
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By boiling water, hardness can be removed if it is due to_________________?
A. light in weight and easy to transport
B. highly resistant to corrosion
C. high flexible to accommodate deflection upto 12°
D. very much smooth and hydraulically efficient
E. all the above
0
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The least thickness of class B cast iron (spun) pipe, is_________________?
A. calcium sulphate
B. magnesium sulphate
C. calcium nitrate
D. calcium bicarbonate
E. none of these