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  • Question

  • Detention period of a settling tank is


  • Options
  • A. average theoretical time required for water to flow through the tank
  • B. time required for flow of water to fill the tank fully
  • C. average time for which water is retained in tank
  • D. ratio of volume of basin of a sedimentation tank to the rate of flow
  • E. all the above.

  • Correct Answer
  • all the above. 

    • Water Supply Engineering problems

    Search Results

    • 1. If Q is discharge is cubicmetres per sec and D is the economical diameter of the pipe. According to Lea

    • Options
    • A. D = 0.67 to 0.87 Q
    • B. D = 0.77 to 0.97 Q
    • C. D = 0.97 to 1.22 Q
    • D. D = 1.22 to 1.33 Q.
      • Discuss
    • 2. According to Buston'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
    • E. none of these.
      • Discuss
    • 3. High pH value of water does not produce

    • Options
    • A. incrustation
    • B. sediment deposits
    • C. turberculation
    • D. corrosion
    • E. both (c) and (d).
      • Discuss
    • 4. The prescribed hardness limit of potable water ranges between

    • Options
    • A. 50 to 75 P.P.M.
    • B. 75 to 115 P.P.M.
    • C. 100 to 150 P.P.M.
    • D. 150 to 200 P.P.M.
    • E. none of these.
      • Discuss
    • 5. The fire demand for ascertaining the empirical formula known as

    • Options
    • A. Kuichling's formula
    • B. Buston's formula
    • C. Freeman formula
    • D. Under Writers formula
    • E. None of these.
      • Discuss
    • 6. Turbidity of water is expressed

    • Options
    • A. in ppm
    • B. in numbers in an arbitrary scale
    • C. by pH value
    • D. by colour code.
      • Discuss
    • 7. Recuperation test is carried out to determine

    • Options
    • A. turbidity of water
    • B. pH value of water
    • C. yield of well
    • D. discharge from a well.
      • Discuss
    • 8. The permissible amount of nitrites present in potable water, is

    • Options
    • A. 10 ppm
    • B. 15 ppm
    • C. 20 ppm
    • D. 45 ppm
    • E. Nil.
      • Discuss
    • 9. Before constructing a dam, the factor to be considered for controlling sedimentation, is

    • Options
    • A. selection of dam site
    • B. construction of check dams
    • C. providing vegetation screens
    • D. providing under-sluices in the dam
    • E. All the above.
      • Discuss
    • 10. A slow sand filter is cleaned if its filter head is higher than

    • Options
    • A. 10 cm to 20 cm
    • B. 20 cm to 40 cm
    • C. 40 cm to 70 cm
    • D. 70 cm to 120 cm
    • E. 120 cm to 150 cm.
      • Discuss

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