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  • Question
  • Rapid gravity filters


  • Options
  • A. were developed by G.W. Fullar
  • B. make use of coarser sand with effective size as 0.5 mm
  • C. yield as high as 30 times the yield of slow sand filters
  • D. are fed with coagulation treated water
  • E. all the above.

  • Correct Answer
  • all the above. 


  • Water Supply Engineering problems


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    • 1. 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
    • 2. Water losses in water supply, is assumed as

    • Options
    • A. 5%
    • B. 7.5%
    • C. 10%
    • D. 22.5%
    • E. 15%.
    • Discuss
    • 3. The temporary hardness of water can be removed by

    • Options
    • A. boiling
    • B. adding lime
    • C. adding alum
    • D. filtration
    • E. sedimentation.
    • Discuss
    • 4. 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
    • 5. 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
    • 6. Property of earth to allow water to pass through it, is known as

    • Options
    • A. perviousness
    • B. porosity
    • C. permeability
    • D. transmissibility.
    • Discuss
    • 7. The chloride content of treated water for public supplies should not exceed

    • Options
    • A. 100 ppm
    • B. 150 ppm
    • C. 200 ppm
    • D. 250 ppm
    • E. 300 ppm.
    • Discuss
    • 8. The external load per unit length of

    • Options
    • A. a pipe laid on, or projecting above the undisturbed ground and covered with fills, is proportional to the square of the external diameter of the pipe
    • B. a flexible pipe burried in narrow trenches and thoroughly compacted side fills, is proportional to the product of the width of the trench and diameter of the pipe
    • C. a rigid pipe burried in a narrow trenches and thoroughly compacted side fills, is proportional to the square of the width of the trench
    • D. all the above.
    • Discuss
    • 9. Disinfection of drinking water is done to remove

    • Options
    • A. turbidity
    • B. odour
    • C. colour
    • D. bacterias
    • E. all the above.
    • Discuss
    • 10. The formula for the head loss in conduits is generally known as

    • Options
    • A. Hazen-William's formula
    • B. Manning's formula
    • C. Darcy-Weisbach formula
    • D. Nikuradse formula.
    • Discuss


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