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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 


  • Water Supply Engineering problems


    Search Results


    • 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


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