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  • Question
  • Normal values of overflow rate for plain sedimentation tank using coagulants, is


  • Options
  • A. 750 to 1000 litres/hr/m2
  • B. 1000 to 1250 litres/hr/m2
  • C. 1250 to 1500 litres/hr/m2
  • D. 1500 litres/hr/m2.

  • Correct Answer
  • 1000 to 1250 litres/hr/m2 


  • Water Supply Engineering problems


    Search Results


    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. If the specific capacity of a well is 0.3183 x 10-3 per sec, the discharge from a well of 4 m diameter under a depression head of 4 m, is

    • Options
    • A. 8 litres/sec
    • B. 10 litres/sec
    • C. 12 litres/sec
    • D. 14 litres/sec
    • E. 16 litres/sec.
    • Discuss
    • 7. The maximum pressure to which a pipe is subjected to during its operation, is known

    • Options
    • A. working pressure
    • B. design pressure
    • C. test pressure
    • D. pipe pressure
    • E. all the above.
    • Discuss
    • 8. The factor to be considered for the source of city water supply, is

    • Options
    • A. quantity and quality of the available water
    • B. elevation of the source of water
    • C. general terrain intervening the area
    • D. all the above.
    • Discuss
    • 9. Pick up the correct statement from the following :

    • Options
    • A. Domestic use of water is 50% of total consumption
    • B. Average consumption of commercial use of water is 25% of total consumption
    • C. Consumption of water on public use is 10% of total consumption
    • D. Waste water and leakage is 15% of total consumption
    • E. all the above.
    • Discuss
    • 10. Dead storage of a reservoir of Q capacity generally provided for silt deposition during its life time, is generally kept

    • Options
    • A. 1/8th Q
    • B. 1/6th Q
    • C. 1/5th Q
    • D. 1/4th Q
    • E. 1/3rd Q.
    • Discuss


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