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  • Question
  • In a rapid sand filter, air binding is caused due to excessive


  • Options
  • A. negative pressure
  • B. pressure
  • C. turbidity
  • D. water pressure
  • E. all the above.

  • Correct Answer
  • negative pressure 


  • Water Supply Engineering problems


    Search Results


    • 1. Chemical coagulation of drinking water, is done

    • Options
    • A. to settle suspended materials
    • B. to increase rate of settlement of suspended materials
    • C. to remove the bacterias
    • D. none of these.
    • Discuss
    • 2. Specific yield of a well is

    • Options
    • A. quantity of water than can be drawn from the well
    • B. flow of water per unit time
    • C. total quantity of water available in the well
    • D. quantity of water per unit time per unit draw-down.
    • Discuss
    • 3. Reciprocating pumps

    • Options
    • A. are not suitable for variable heads
    • B. are four times costlier than centrifugal pumps
    • C. are not suitable for pumping water containing sediments
    • D. single stroke produce pulsating flow
    • E. none of these.
    • Discuss
    • 4. In an artesian acquifer, the draw downs in two observation wells at distances 100 m, and 200 m were found same after one hour and x hours respectively. The value of x, is

    • Options
    • A. 2 hours
    • B. 4 hours
    • C. 9 hours
    • D. 16 hours.
    • Discuss
    • 5. Pick up the incorrect statement from the following :

    • Options
    • A. The net amount of water which joins the surface streams in a catchment, is known as surface run-off
    • B. The amount of water which joins the stream from the underground water, is called base flow
    • C. The yearly run off in cm depth over the catchment, is termed as the yield of the drainage basin
    • D. The yield of drainage in cm depth multiplied by the area of the catchment gives the annual volume of water
    • E. None of these.
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 'Shrouding' is essentially provided in

    • Options
    • A. strainer type wells
    • B. cavity type wells
    • C. slotted type well
    • D. all the above.
    • Discuss
    • 9. The coefficient of permeability of soils, is generally expressed in

    • Options
    • A. cm/sec
    • B. cm/minute
    • C. cm2/sec
    • D. cm2/minute.
    • Discuss
    • 10. 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


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