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  • Question
  • The equation The equation in which Q is yearly run off in cm, P is yearly total rainfall in cm, H is difference o in which Q is yearly run off in cm, P is yearly total rainfall in cm, H is difference of R.L.s. of lowest and highest points and A is area of catchment in square metres, is known as


  • Options
  • A. English formula
  • B. Khosla's formula
  • C. Justin's formula
  • D. Vermule's formula.

  • Correct Answer
  • Justin's formula 


  • Water Supply Engineering problems


    Search Results


    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. A pressure conduit laid under ground, may not be subjected to

    • Options
    • A. internal pressure of water
    • B. pressure due to external load
    • C. longitudinal temperature stress
    • D. longitudinal stresses due to unbalanced pressure to bends
    • E. none of these.
    • Discuss
    • 7. The best process of disinfection of public water supply, is by

    • Options
    • A. boiling
    • B. chlorination
    • C. adding lime
    • D. adding zone.
    • Discuss
    • 8. E. Coli bacterias die in water having pH greater than

    • Options
    • A. 5.5
    • B. 6.5
    • C. 7.5
    • D. 8.5
    • E. 9.5
    • Discuss
    • 9. The water level in an open well was depressed by pumping 2.5 m and recuperated 2.87 m in 3 hours and 50 minutes. The yield of the well per minute is

    • Options
    • A. 0.0033
    • B. 0.0044
    • C. 0.0055
    • D. 0.0066
    • Discuss
    • 10. Mathamoglobinemia, or blue baby disease is caused due to

    • Options
    • A. chlorides
    • B. nitrites
    • C. nitrates
    • D. sulphides.
    • Discuss


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