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  • Question

  • Time of concentration


  • Options
  • A. is the time taken, for precipitation
  • B. duration of rainfall.
  • C. time taken for all the ran off to reach the drain
  • D. time taken for the storm water to travel from the most remote point to the drain.

  • Correct Answer
  • time taken for the storm water to travel from the most remote point to the drain. 

    • Water Supply Engineering problems

    Search Results

    • 1. Sunlight

    • Options
    • A. helps growth of bacterias
    • B. impedes growth of algae
    • C. increases dissolved oxygen content
    • D. reduces turbidity.
      • Discuss
    • 2. Pick up the correct statement from the following :

    • Options
    • A. Detention period for plain sedimentation tanks ranges between 4 to 8 hours
    • B. Detention period for sedimentation tanks, using coagulants usually ranges between 2 to 4 hours
    • C. The horizontally flow velocity in sedimentation tanks, is generally limited to 0.3 m/minute
    • D. All the above.
      • Discuss
    • 3. Economic height of a dam is the height corresponding to which

    • Options
    • A. cost of the dam per unit of storage is minimum
    • B. amount of silting is less
    • C. cost of dam per unit storage is maximum
    • D. free board provided is least
    • E. none of these.
      • Discuss
    • 4. Pick up the incorrect statement from the following regarding fire hydrants

    • Options
    • A. Fire hydrants are fitted in water mains at 100 m to 150 m apart at fire
    • B. The minimum water pressure hydrants, is kept 1.5 kg/cm2
    • C. The water at pressure 1 to 1.5 kg/cm2 is made available for 4 to 5 hours for constant use
    • D. None of these.
      • Discuss
    • 5. According to Kuichling's formula, fire demand in litres per minute for a population of P thousands, is

    • Options
    • A. 3182 P
    • B.
    • C. 4637 P [1 - 0.01 P]
    • D. 5663 P.
      • Discuss
    • 6. P0, P1, P2 be the populations of a city at times t0, t1 and t2 = 2t1, the saturation value of the population Ps of the city, is

    • Options
    • A.
    • B.
    • C.
    • D.
    • E. None of these.
      • Discuss
    • 7. In slow sland filters, the turbidity of raw water can be removed only up to

    • Options
    • A. 60 mg/litre
    • B. 75 mg/litre
    • C. 100 gm/litre
    • D. 150 mg/litre.
      • Discuss
    • 8. Q is the discharge from an unconfined tube well with depression head s through its pipe of radius rw. If the radius of influence is R, the length of the required strainer, is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 9. As per IS : 1172-1963, water required per head per day for average domestic purposes, is

    • Options
    • A. 50 litres
    • B. 65 litres
    • C. 85 litres
    • D. 105 litres
    • E. 135 litres.
      • Discuss
    • 10. By boiling water, hardness can be removed if it is due to

    • Options
    • A. calcium sulphate
    • B. magnesium sulphate
    • C. calcium nitrate
    • D. calcium bicarbonate
    • E. none of these.
      • Discuss

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