Water Supply Engineering problems
- 1. Q is the discharge from an unconfined tube well with depression head S through a pipe of radius rw. If the radius of influence is R, the minimum required length of the strainer, is
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 2. Demand for public uses in a city, does not include water required for
Options- A. watering of public parks
- B. watering of public gardens
- C. sprickling on roads
- D. drinking purposes. Discuss
Correct Answer: drinking purposes.
- 3. 'Shrouding' is essentially provided in
Options- A. strainer type wells
- B. cavity type wells
- C. slotted type well
- D. all the above. Discuss
Correct Answer: slotted type well
- 4. The coefficient of permeability of soils, is generally expressed in
Options- A. cm/sec
- B. cm/minute
- C. cm2/sec
- D. cm2/minute. Discuss
Correct Answer: cm/sec
- 5. Normal values of overflow rate for plain sedimentation tanks in litres/hr/m2, generally range between
Options- A. 100 to 250
- B. 250 to 500
- C. 500 to 750
- D. 750 to 1000 Discuss
Correct Answer: 500 to 750
- 6. Standard unit of turbidity of water is in one litre of distilled water, one milligram of finely divided
Options- A. silica
- B. mud
- C. clay
- D. organic matter. Discuss
Correct Answer: silica
- 7. Slow sand filter is used if maximum turbidity of raw water is less than
Options- A. 10 gm/litre
- B. 20 gm/litre
- C. 30 gm/litre
- D. 40 gm/litre
- E. 50 gm/litre. Discuss
Correct Answer: 50 gm/litre.
- 8. The temporary hardness of water can be removed by
Options- A. boiling
- B. adding lime
- C. adding alum
- D. filtration
- E. sedimentation. Discuss
Correct Answer: boiling
- 9. Water losses in water supply, is assumed as
Options- A. 5%
- B. 7.5%
- C. 10%
- D. 22.5%
- E. 15%. Discuss
Correct Answer: 15%.
- 10. A centrifugal pump is required to be primed before starting if it is located
Options- A. at higher level than water level of reservoir
- B. at lower level than water level of reservoir
- C. both (a) and (b)
- D. neither (a) nor (b). Discuss
Correct Answer: at higher level than water level of reservoir
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