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Civil Engineering :: Water Supply Engineering

  1. Pick up the correct statement from the following :

  2. A.
    The internal pressure within a pipe, is caused due to water head and hammer pressure
    B.
    The internal pressure in a pipe running full is equal to vertical ordinate between hydraulic gradient line and centre of the pipe
    C.
    In pressure pipes with water at rest, the pressure is equal to water head
    D.
    Sudden closure of a valve, causes the water hammer pressure
    E.
    All the above.

  3. Surface water is obtained from

  4. A.
    well
    B.
    springs
    C.
    artesian well
    D.
    rain.

  5. Hardness of water is caused due to

  6. A.
    calcium sulphate
    B.
    magnesium sulphate
    C.
    calcium nitrates
    D.
    calcium bicarbonates
    E.
    all the above.

  7. Flow through period, in sedimentation tanks, is

  8. A.
    equal to detention period
    B.
    more than detention period
    C.
    less than detention period
    D.
    detention period divided by displacement efficiency
    E.
    none of these.

  9. Normal values of overflow rate for plain sedimentation tank, is

  10. A.
    250 to 500 litres/hr/m2
    B.
    500 to 750 litres/hr/m2
    C.
    750 to 1000 litres/hr/m2
    D.
    1000 to 1250 litres/hr/m2.

  11. If p is total internal pressure, d is diameter of pressure conduit and t is thickness of conduit, the Hoop's stress is


  12. The force which develops in a pressure conduit supported on trestles, is

  13. A.
    tension
    B.
    compression
    C.
    temperature stress
    D.
    flexural stress.

  14. After cleaning a slow sand filter, the filtered water is not used for

  15. A.
    6 hours to 12 hours
    B.
    12 hours to 18 hours
    C.
    18 hours to 24 hours
    D.
    24 hours to 36 hours
    E.
    48 hours.

  16. A pressure conduit laid under ground, may not be subjected to

  17. A.
    internal pressure of water
    B.
    pressure due to external load
    C.
    longitudinal temperature stress
    D.
    longitudinal stresses due to unbalanced pressure to bends
    E.
    none of these.

  18. The period of cleaning of a slow sand filter, is usually

  19. A.
    5 to 10 days
    B.
    two weeks to three weeks
    C.
    one month to three months
    D.
    three months to six months
    E.
    one year.