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Civil Engineering :: Water Supply Engineering

  1. The intake opening is generally covered by a screen to prevent entry of debris etc. and its level is kept

  2. A.
    at the level of water of the source
    B.
    at the bottom of water of the source
    C.
    at about 2.5 m above the bottom
    D.
    none of these.

  3. In rapid sand filters the ratio of length and diameter of the lateral, should not be greater than

  4. A.
    10
    B.
    15
    C.
    20
    D.
    25

  5. The maximum permissible hardness for public supplies is

  6. A.
    95 mg/litre
    B.
    105 mg/litre
    C.
    115 mg/litre
    D.
    125 mg/litre
    E.
    150 mg/litre.

  7. Plain chlorination is used for water

  8. A.
    with turbidities less than 20 mg/litre
    B.
    obtained from clear lakes
    C.
    consumed during emergencies
    D.
    supplies to armies during war
    E.
    all the above.

  9. Underground water is obtained from

  10. A.
    rains
    B.
    rivers
    C.
    lakes
    D.
    reservoirs
    E.
    springs.

  11. Water may contain

  12. A.
    bicarbonate alkalinity
    B.
    carbonate alkalinity
    C.
    hydroxide alkalinity
    D.
    caustic alkalinity
    E.
    all the above.

  13. Pick up the correct statement from the following :

  14. A.
    The pH value of neutral water is 7
    B.
    The maximum acidity is obtained when pH value is zero
    C.
    The maximum alkalinity is obtained when pH value is 14.
    D.
    All the above.

  15. For controlling algae, the most commonly used chemical, is

  16. A.
    copper sulphate
    B.
    alum
    C.
    lime
    D.
    bleaching powder.

  17. According to Godrich the ratio of peak demand rate to mean demand is

  18. A.
    B.
    C.
    D.
    E.
    All the above.

  19. The head against which the motor works for lifting water, is

  20. A.
    maximum depth of water table below ground level
    B.
    maximum depression head
    C.
    velocity head
    D.
    frictional losses in the delivery pipe
    E.
    all the above.