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Civil Engineering :: Water Supply Engineering

  1. In pumping stations, the type of joint generally used, is

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

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  3. The permissible pH value for public water supplies may range between

  4. A.
    4.5 to 5.5
    B.
    5.5 to 6.5
    C.
    6.5 to 8.5
    D.
    8.5 to 10.5
    E.
    none of these.

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  5. The strainer type tube well, is unsuitable for

  6. A.
    coarse gravels
    B.
    fine sandy strata
    C.
    clean gravels
    D.
    none of these.

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  7. Pick up the correct statement from the following :

  8. A.
    Lime may be used to soften the hard water
    B.
    Excessive use of lime may kill the bacterias
    C.
    Excessive lime when added to water, raises its pH value
    D.
    When lime raises pH value of water to about 9.5, 100% bacterias are removed
    E.
    All the above.

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  9. Specific capacity or yield of wells, is generally expressed, as

  10. A.
    m3 per sec
    B.
    m3/hour
    C.
    m3/hour/m2
    D.
    m3/hour/m2/m
    E.
    m3/hour/m2/sec.

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  11. The depth of the water table at a place is 45 m below the general ground level. To lift water from a deep tube well in such a locality, the type of pump to be installed is

  12. A.
    Centrifugal pump
    B.
    Reciprocating pump
    C.
    Deep well turbine pump
    D.
    None of these.

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  13. Critical time for developing a water hammer, is the time required for

  14. A.
    closing the valve
    B.
    the wave to travel from valve to the reservoir
    C.
    the wave to travel from the valve to the reservoir and back
    D.
    none of these.

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  15. According to Buston's formula, fire demand in litres per minute for a population of P thousands, is

  16. A.
    3182 P
    B.
    C.
    4637 P (1 - 0.01 P)
    D.
    5663 P
    E.
    none of these.

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  17. The ratio of maximum hourly consumption and average hourly consumption of the maximum day, is

  18. A.
    1.2
    B.
    1.5
    C.
    1.8
    D.
    2.4
    E.
    2.7

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  19. Cast iron pipes are generally preferred to, because

  20. A.
    of moderate cost
    B.
    of ease to join
    C.
    of durability
    D.
    of longer life
    E.
    all the above.

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