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Civil Engineering :: Water Supply Engineering

  1. Rapid sand filter

  2. A.
    should be preceeded by coagulation and sedimentation
    B.
    uses rapid sand as filter media
    C.
    is used after slow sand filtering has been done
    D.
    can combine disinfection also.

  3. Pick up the correct statement from the following :

  4. A.
    Copper pipes are highly resistant to acidic and alkaline water
    B.
    Wrought iron pipes are lighter than cast iron pipes
    C.
    Wrought iron pipes corrode quickly and are less durable
    D.
    Wrought iron pipes coated with zinc, are called galvanised iron pipes
    E.
    All the above.

  5. Rapid gravity filters can remove bacterial impurities up to a maximum of

  6. A.
    50%
    B.
    60%
    C.
    70%
    D.
    80%
    E.
    90%.

  7. Cast iron pipes

  8. A.
    are widely used in city water supplies
    B.
    resist corrosion satisfactorily
    C.
    may last for 100 years
    D.
    are normally manufactured in lengths of about 3.5 m
    E.
    all the above.

  9. Run off is the quantity of water which flows

  10. A.
    in sewer pipes
    B.
    due to leakage in pipes
    C.
    in rivers
    D.
    none of these.

  11. Efficiency of removing bacterias from raw water by a slow sand filter, is

  12. A.
    80% to 81%
    B.
    85% to 86%
    C.
    90% to 97%
    D.
    98% to 99%.

  13. De-chlorination is followed by

  14. A.
    post-chlorination
    B.
    pre-chlorination
    C.
    double-chlorination
    D.
    super-chlorination.

  15. The bed slope in slow sand filters, is generally kept

  16. A.
    1 in 50
    B.
    1 in 75
    C.
    1 in 100
    D.
    1 : 200

  17. When gravity and pumping systems of water distribution are adopted, the type of distribution reservoir, is

  18. A.
    elevated tank
    B.
    ground source reservoir
    C.
    intz tank
    D.
    stand pipe.

  19. The average domestic consumption under normal conditions in an Indian city per day per person, is

  20. A.
    105 litres
    B.
    115 litres
    C.
    125 litres
    D.
    135 litres
    E.
    150 litres.