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- Question
The period of cleaning of a slow sand filter, is usually
Options- A. 5 to 10 days
- B. two weeks to three weeks
- C. one month to three months
- D. three months to six months
- E. one year.
- Correct Answer
- one month to three months
- 1. Flow through period, in sedimentation tanks, is
Options- A. equal to detention period
- B. more than detention period
- C. less than detention period
- D. detention period divided by displacement efficiency
- E. none of these. Discuss
- 2. Increase in population of a rapidly growing city, may be estimated by
Options- A. arithmetical mean method
- B. geometrical method
- C. incremental increase method
- D. graphical comparison method. Discuss
- 3. A city supply includes
Options- A. domestic water demand
- B. industrial and commercial water demands
- C. demand for public uses and fire
- D. water losses
- E. all the above. Discuss
- 4. Continuous flow of water can be expected from
Options- A. gravity springs
- B. surface springs
- C. artesian springs
- D. none of these. Discuss
- 5. Pick up the correct statement from the following regarding radial flow centrifugal pumps :
Options- A. These are provided with volute type or turbine type casings
- B. In involute type of radial flow centrifugal pump, the impeller discharges into a gradually expanding spiral casing
- C. In turbine type of radial flow centrifugal pumps, the impeller is surrounded by stationary guide vanes to reduce the velocity of water
- D. The efficiency of turbine type of radial flow centrifugal pump, is always higher than that of volute type
- E. All the above. Discuss
- 6. To detect the turbidity of the order of 0 to 1000 P.P.M. the instrument used is
Options- A. turbidimeter
- B. Jackson turbidimeter
- C. Baylis turbidimeter
- D. Hallige turbidimeter. Discuss
- 7. Sluice valves are fitted in a distribution system
Options- A. along straight length of pipes at suitable intervals
- B. at the junctions of the pipes
- C. at the branching off points of sub-mains
- D. all the above. Discuss
- 8. The lowest outlet sluice in a dam is provided
Options- A. below the dead storage
- B. on the top level of dead storage
- C. on the top level of useful storage
- D. at the centre of the dam. Discuss
- 9. Mud balls may be removed by
Options- A. breaking and washing
- B. washing the filter with a solution of caustic soda
- C. removing, cleaning and replacing the damaged sand
- D. all the above. Discuss
- 10. Pick up the correct statement from the following :
Options- A. Lime may be used to soften the hard water
- B. Excessive use of lime may kill the bacterias
- C. Excessive lime when added to water, raises its pH value
- D. When lime raises pH value of water to about 9.5, 100% bacterias are removed
- E. All the above. Discuss
Water Supply Engineering problems
Search Results
Correct Answer: less than detention period
Correct Answer: geometrical method
Correct Answer: all the above.
Correct Answer: artesian springs
Correct Answer: All the above.
Correct Answer: Baylis turbidimeter
Correct Answer: all the above.
Correct Answer: on the top level of dead storage
Correct Answer: all the above.
Correct Answer: All the above.
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