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| Publisher | Faculty Notes |
| Author: | Moraj Chandra |
| Number of Pages | 57 |
| Available | Available in all digital devices |
D.Higher copper content affects the lungs E. All the above. 8. Pick up the incorrect statement from the following regarding fire hydrants A. Fire hydrants are fitted in water mains at 100 m to 150 m apart at fire B. The minimum water pressure hydrants, is kept 1.5 kg cm2 C. The water at pressure 1 to 1.5 kg cm2 is made available for 4 to 5 hours for constant use D.None of these. 9. The specific retention is least in case of A. Clay B. Sand C. Silt D.Coarse gravel. 10. B.O.D. of treated water should be A. 10 ppm B. 25 ppm C. 20 ppm D.30 ppm E. Nil. 11. Most commonly used pump for lifting water in water supply mains, is A.axialflow pump B. reciprocating pump C. rotary type pump D.centrifugal pumps E. none of these. 12. Economic height of a dam is the height corresponding to which A.cost of the dam per unit of storage is minimum B. amount of silting is less C. cost of dam per unit storage is maximum D.free board provided is least E. none of these. 13. Distribution mains of any water supply, is normally designed for its average daily requirement A. 100 B. 150 C. 200 D.225 .
14. If pH value of water is A. 7 water it is said to be neutral B. less than 7 it is said to be acidic
C. more than 7 it is said to be alkaline D.all the above. 15. In pressure supply mains, water hammer pressure is reduced by providing A. sluice valves B. air valves C.pressure relief valves D.none of the these. 16. P0, P1, P2 be the populations of a city at times t0, t1 and t2 2t1, the saturation value of the population Ps of the city, is A.
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