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  • Question
  • Detention time for plain sedimentation tank usually ranges from


  • Options
  • A. 2 to 4 hours
  • B. 4 to 8 hours
  • C. 6 to 10 hours
  • D. 8 to 12 hours
  • E. 12 to 16 hours.

  • Correct Answer
  • 4 to 8 hours 


  • Water Supply Engineering problems


    Search Results


    • 1. Pick up the correct statement from the following :

    • Options
    • A. If ports are closed, the dry intake towers will not have any water
    • B. Even if ports are closed, the wet intake tower will have water filled up to reservoir level
    • C. The dry intake towers are generally constructed with heavier construction to resist buoyant forces
    • D. No buoyant force acts on wet intake towers
    • E. All the above.
    • Discuss
    • 2. Velocity of flow of water in plain sedimentation water tank, is normally kept

    • Options
    • A. 3 cm/minute
    • B. 10 cm/minute
    • C. 20 cm/minute
    • D. 30 cm/minute
    • E. 40 cm/minute.
    • Discuss
    • 3. The type of joint generally used in cast iron pipes, is

    • Options
    • A. socket and spigot joint
    • B. flanged joint
    • C. dresser coupling joint
    • D. flexible joint
    • E. all the above.
    • Discuss
    • 4. 135 litres of water per person per day, is provided in

    • Options
    • A. nurses homes
    • B. hostels
    • C. residential schools
    • D. all the above.
    • Discuss
    • 5. Surface water may

    • Options
    • A. contain large amount of impurities
    • B. be contaminated by impurities
    • C. contain disease producing bacterias
    • D. all the above.
    • Discuss
    • 6. The rate of silting in a reservoir

    • Options
    • A. is less in the beginning
    • B. remains constant throughout
    • C. is more in the beginning
    • D. is more in the beginning and reduces in the end
    • E. none of these.
    • Discuss
    • 7. Shales are

    • Options
    • A. porous
    • B. permeable
    • C. porous and permeable
    • D. porous but not permeable
    • E. neither porous nor permeable.
    • Discuss
    • 8. Manholes are less common in

    • Options
    • A. cast iron pipes
    • B. steel pipes
    • C. hume steel pipes
    • D. R.C.C. pipes.
    • Discuss
    • 9. Pipes are laid parallel

    • Options
    • A. to increase the capacity of the water supply
    • B. to provide a means of repairing without closing water supply
    • C. to meet the requirement of excessive supply
    • D. all the above.
    • Discuss
    • 10. Pick up the correct statement from the following :

    • Options
    • A. The water level in a still well, represents the ground water table level
    • B. The difference between water table level and the water level in a well after pumping, is called depression head
    • C. The surface of water table surrounding a well during pumping, forms a cone of depression
    • D. The distance from the centre of the well up to the place where level of water table is not affected, is called radius of influence
    • E. All the above.
    • Discuss


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