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Civil Engineering :: Water Supply Engineering

  1. Asbestos pipes are joined by means of

  2. A.
    flanged joint
    B.
    flexible joint
    C.
    dresser coupling joint
    D.
    simplex joint
    E.
    socket and spigot joint.

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  3. Abyssinian tube well is a special type of

  4. A.
    slotted type wells
    B.
    cavity type wells
    C.
    strainer type well
    D.
    none of these.

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  5. Chlorination of water does not remove

  6. A.
    ammonia content
    B.
    B.O.D.
    C.
    organic matter content
    D.
    dissolved oxygen.

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  7. The efficiency of a pumping set, is generally assumed

  8. A.
    50%
    B.
    55%
    C.
    60%
    D.
    65%
    E.
    70%.

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  9. To remove very fine suspended particles from water, the method adopted is

  10. A.
    screening
    B.
    sedimentation
    C.
    boiling
    D.
    filtration.

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  11. Velocity of flow of water in plain sedimentation water tank, is normally kept

  12. A.
    3 cm/minute
    B.
    10 cm/minute
    C.
    20 cm/minute
    D.
    30 cm/minute
    E.
    40 cm/minute.

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  13. The most important and widely used tube well in India, is

  14. A.
    strainer well
    B.
    cavity well
    C.
    slotted well
    D.
    perforated pipe well.

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  15. Pick up the correct statement from the following :

  16. A.
    The precipitation during its travel in atmosphere dissolves certain gases
    B.
    Rain water which percolates through the ground, is free from suspended materials
    C.
    Under ground water may dissolve minerals and salts present in the earth's layers
    D.
    Small quantities of iron, calcium and magnesium dissolved in water, may be useful for human health
    E.
    All the above.

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  17. The maximum permissible chloride content in treated water of public water supplies should not exceed

  18. A.
    50 P.P.M.
    B.
    100 P.P.M.
    C.
    150 P.P.M.
    D.
    200 P.P.M.
    E.
    250 P.P.M.

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  19. To pump water from a water reservoir 3 m deep and maximum water level at 135 m, a pump is installed to lift water up to R.L. 175 m at a constant rate of 36, 00, 000 litres per hour. If the length of the pipe is 1506 m and f = 0.01, ignoring other minor losses and assuming the economical diameter from Lea's formula D = 1.2 Q, the water horse power of the pump is

  20. A.
    400
    B.
    450
    C.
    500
    D.
    580
    E.
    600

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