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- Question
The standard B.O.D. at 20&Deg;C, is taken for the consumption in
Options- A. one day
- B. 2 days
- C. 3 days
- D. 4 days
- E. 5 days.
- Correct Answer
- 5 days.
- 1. An area is declared drought affected if its mean rainfall is less than
Options- A. 50%
- B. 60%
- C. 75%
- D. 80%
- E. 85%. Discuss
- 2. Check valves are installed
Options- A. on the delivery side of the pumping set
- B. at the interconnections between polluted water system and a potable water system
- C. both (a) and (b)
- D. neither (a) nor (b). Discuss
- 3. Normal values of overflow rate for plain sedimentation tank, is
Options- A. 250 to 500 litres/hr/m2
- B. 500 to 750 litres/hr/m2
- C. 750 to 1000 litres/hr/m2
- D. 1000 to 1250 litres/hr/m2. Discuss
- 4. At the socket and spigot joint,
Options- A. enlarged end of the pipe is called socket
- B. normal end of the pipe is called spigot
- C. spigot is fitted into the socket
- D. molten lead is used for water proofing
- E. all the above. Discuss
- 5. If discharge of a pump is 0.16 cumecs, the economic diameter of pipe, is
Options- A. 0.488 m
- B. 4.88 cm
- C. 48.8 cm
- D. 4.88 m
- E. none of these. Discuss
- 6. Quality of water is said to be good if it is
Options- A. free from suspended matter
- B. colourless
- C. free from pathogenic organism
- D. tasteless
- E. all the above. Discuss
- 7. Pick up the correct statement from the following :
Options- A. The internal pressure within a pipe, is caused due to water head and hammer pressure
- B. The internal pressure in a pipe running full is equal to vertical ordinate between hydraulic gradient line and centre of the pipe
- C. In pressure pipes with water at rest, the pressure is equal to water head
- D. Sudden closure of a valve, causes the water hammer pressure
- E. All the above. Discuss
- 8. The main process to purify water by filtration, is
Options- A. mechanical straining
- B. flocculation and sedimentation
- C. biological metabolism
- D. electronic change
- E. all the above. Discuss
- 9. Disinfection of water with ozone is not good because
Options- A. it vanishes before water reaches the consumers
- B. it removes the colour, taste and odour from water as bacterias
- C. it adds taste to the water
- D. it is more efficient than chlorine in killing bacterias
- E. none of these. Discuss
- 10. The main draw-back of centrifugal pump, is
Options- A. necessity of priming
- B. discharge from pump varies with the load of water
- C. for high heads, efficiency is low up to 50%
- D. the suction lift is limited to 6 m
- E. all the above. Discuss
Water Supply Engineering problems
Search Results
Correct Answer: 85%.
Correct Answer: both (a) and (b)
Correct Answer: 500 to 750 litres/hr/m2
Correct Answer: all the above.
Correct Answer: 0.488 m
Correct Answer: all the above.
Correct Answer: All the above.
Correct Answer: all the above.
Correct Answer: it is more efficient than chlorine in killing bacterias
Correct Answer: all the above.
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