Water Supply Engineering problems
- 1. Pick up the incorrect statement from the following :
Options- A. Porosity of clay sand soil is 45%
- B. Porosity of pure sand is 35%
- C. Porosity of sand stone is up to 15%
- D. Least porosity is that of granite and quartz
- E. None of these. Discuss
Correct Answer: None of these.
- 2. The pH value of water is kept slightly less than 7 so that hydrochloride ions may combine with ammonia ions to form
Options- A. Mono-chloramine (NHCl)
- B. Di-chloramine (NH2Cl)
- C. Nitrogen trichloramine (NCl3)
- D. All the above. Discuss
Correct Answer: All the above.
- 3. The ensure proper growth of children's teeth, the quantity of flouride used in water mains, is
Options- A. 1 mg/litre
- B. 2 mg/litre
- C. 3 mg/litre
- D. 4 mg/litre
- E. 5 mg/litre. Discuss
Correct Answer: 1 mg/litre
- 4. The maximum pressure which the pipe can withstand without any leakage during hydrostatic pressure test, is called
Options- A. Working pressure
- B. Design pressure
- C. Test pressure
- D. Hydrostatic pressure. Discuss
Correct Answer: Test pressure
- 5. Normal values of overflow rate for sedimentation tanks using coagulants in litres/hr/m2 , generally range between
Options- A. 250 to 500
- B. 500 to 750
- C. 750 to 1000
- D. 1000 to 1250 Discuss
Correct Answer: 1000 to 1250
- 6. Ground water from artesian wells
Options- A. contains no suspended materials
- B. contains dissolved salts
- C. may be saltish and hard
- D. generally require lesser treatment
- E. all the above. Discuss
Correct Answer: all the above.
- 7. If average volume of sediment deposits is one-tenth million cubic metres per year in a reservoir of total capacity 10 million cubic metres, the dead storage will be filled up, in
Options- A. 10 years
- B. 15 years
- C. 20 years
- D. 25 years
- E. 50 years. Discuss
Correct Answer: 25 years
- 8. The total domestic consumption in a city water supply, is assumed
Options- A. 20%
- B. 30%
- C. 40%
- D. 60%. Discuss
Correct Answer: 60%.
- 9. In distribution pipes, air valves are provided at
Options- A. lower points
- B. junction points
- C. higher points
- D. any where. Discuss
Correct Answer: higher points
- 10. The maximum permissible chloride content in treated water of public water supplies should not exceed
Options- A. 50 P.P.M.
- B. 100 P.P.M.
- C. 150 P.P.M.
- D. 200 P.P.M.
- E. 250 P.P.M. Discuss
Correct Answer: 250 P.P.M.
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