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Civil Engineering :: Water Supply Engineering

  1. An ideal sand for filters should be

  2. A.
    free from dirt and other impurities
    B.
    uniform in nature and size
    C.
    hard and resistant
    D.
    all the above.

  3. The maximum non-verticality of the bore of a well 200 m deep, may be permitted up to

  4. A.
    25 cm
    B.
    50 cm
    C.
    75 cm
    D.
    100 cm
    E.
    150 cm.

  5. By adding 1 ml of orthotolidine solution to 100 ml chlorinated water taken after contact period, the residual chlorine makes the colour of solution

  6. A.
    yellowish
    B.
    greenish
    C.
    bluish
    D.
    reddish
    E.
    violet.

  7. From the surface of reservoir, evaporation may be minimised by sprinkling

  8. A.
    Spirit
    B.
    Hydrochloric acid
    C.
    Cetyl alcohol
    D.
    Methane
    E.
    None of these.

  9. Gravity conduits are generally in the form of

  10. A.
    canals
    B.
    flumes
    C.
    aqueduct
    D.
    tunnels
    E.
    all the above.

  11. Pick up the correct statement from the following :

  12. A.
    The ratio of the total sediment deposited in the reservoir to the total sediment flowing in the river, is called trap efficiency
    B.
    The ratio of the reservoir capacity to the total inflow of water in it, is generally called capacity inflow ratio
    C.
    Small capacity reservoirs on large rivers generally, silt less
    D.
    Large capacity reservoirs on small rivers generally silt more
    E.
    All the above.

  13. Pressure relief valves are provided in water mains

  14. A.
    to reduce the pressure
    B.
    at low points
    C.
    upstream of sluice
    D.
    all the above.

  15. Pick up the incorrect statement from the following :

  16. A.
    Iron salts produce heavy flocs and hence remove more suspended matter
    B.
    Iron salts remove hydrogen sulphides
    C.
    Iron salts can be used over a limited range of pH values
    D.
    Iron salts impart corrosiveness to water.

  17. The percentage of chlorine in fresh bleaching powder is roughly

  18. A.
    50 to 60
    B.
    30 to 35
    C.
    40 to 50
    D.
    20 to 25

  19. Higher yield may be expected from

  20. A.
    gravity springs
    B.
    surface springs
    C.
    artesian springs
    D.
    all the above.