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  • Question

  • Percussion drilling is unsuitable in


  • Options
  • A. unconsolidated sand
  • B. unconsolidated gravel
  • C. quick sand
  • D. consolidated rocks.

  • Correct Answer
  • consolidated rocks. 

    • Water Supply Engineering problems

    Search Results

    • 1. During treatment of water, sedimentation is done

    • Options
    • A. before filtration
    • B. after filtration
    • C. simultaneously with filtration
    • D. along with chlorination.
      • Discuss
    • 2. Gravity conduits for carrying water from the source are

    • Options
    • A. canals
    • B. flumes
    • C. acqueducts
    • D. all the above.
      • Discuss
    • 3. Hardness of water is caused due to

    • Options
    • A. calcium sulphate
    • B. magnesium sulphate
    • C. calcium nitrates
    • D. calcium bicarbonates
    • E. all the above.
      • Discuss
    • 4. After cleaning a slow sand filter, the filtered water is not used for

    • Options
    • A. 6 hours to 12 hours
    • B. 12 hours to 18 hours
    • C. 18 hours to 24 hours
    • D. 24 hours to 36 hours
    • E. 48 hours.
      • Discuss
    • 5. Hard water contains

    • Options
    • A. calcium
    • B. magnesium bicarbonates
    • C. magnesium sulphate
    • D. all the above.
      • Discuss
    • 6. While determining the yield of open wells by the pumping test

    • Options
    • A. velocity of recharging water, increases with depression head
    • B. depression head resulting at critical velocity, is called critical depression head
    • C. working head is generally limited to rd of the critical depression head
    • D. maximum safe yield of an open well, is expected at critical depression head.
      • Discuss
    • 7. The maximum hourly consumption, is generally taken as

    • Options
    • A. 110%
    • B. 120%
    • C. 130%
    • D. 140%
    • E. 150%.
      • Discuss
    • 8. A water channel supported above the ground over trestles, is generally called

    • Options
    • A. flume
    • B. canal
    • C. adueduct
    • D. tunnel
    • E. all the above.
      • Discuss
    • 9. If intensity of rainfall in cm per hour is I, percentage coefficient of run-off is P, area of catchment in square kilometres is A, the total run-off Q, is given by

    • Options
    • A. Q = 1.758 x 102 x API
    • B. Q = 2.758 x 102 x API
    • C. Q = 2.758 x 103 x API
    • D.
    • E.
      • Discuss
    • 10. The superimposed load transmitted to the pipe, is generally evaluated by Bousiness formula

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss

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