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Civil Engineering :: Water Supply Engineering

  1. Most important method for calculating discharge for planning a water supply project, is

  2. A.
    velocity area method
    B.
    weir or spillway method
    C.
    use of venturi-meter
    D.
    using power plant consumption
    E.
    none of these.

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  3. Alkalinity in water may be caused due to

  4. A.
    calcium and magnesium bicarbonates
    B.
    sodium carbonate
    C.
    potassium carbonate
    D.
    calcium hydroxide
    E.
    all the above.

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  5. Open channels supported over tres-les, are generally known as

  6. A.
    raised canals
    B.
    acqueducts
    C.
    syphons
    D.
    flumes.

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  7. For least effect on the water table, the tube wells must be dug one in every

  8. A.
    0.5 sq km
    B.
    0.75 sq km
    C.
    1.0 sq km
    D.
    1.25 sq km
    E.
    1.5 sq km.

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  9. In plain sedimentation tanks under normal conditions, impurities are removed upto

  10. A.
    60%
    B.
    70%
    C.
    80%
    D.
    90%.

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  11. Pick up the correct statement from the following :

  12. A.
    Due to boiling, the bacterias present in water can be destroyed
    B.
    Lime may be used for softening hard water
    C.
    Excess lime when added to water, raises the pH value of water
    D.
    the bacterias do not survive in water having pH value exceeding 9.5
    E.
    All the above.

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  13. For the same draw down in two observations wells at distances r1 and r2, the times after start of pumping are t1 and t2 hours respectively. The relation which holds good is

  14. A.
    B.
    C.
    D.
    E.
    none of these.

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  15. The valve fitted closely in a recess against an opening in a pipe, is generally

  16. A.
    wedge shaped circular disc
    B.
    spherical disc
    C.
    parallelopiped disc
    D.
    conical shaped circular disc.

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  17. For calculation of economical diameter D of a pipe in metres for a discharge Q to be pumped in cumecs, Lea suggested the empirical formula

  18. A.
    D = 0.22 Q
    B.
    D = 1.22 Q
    C.
    D = 2.22 Q
    D.
    D = 3.22 Q
    E.
    D = 1.33 Q.

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  19. S1 and S2 are the draw downs in an observation well at times t1 and t2 after pumping. For discharge Q and coefficient of transmissibility T, the relationship, is

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