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Civil Engineering :: Water Supply Engineering

  1. Alum is a

  2. A.
    coagulant
    B.
    flocculant
    C.
    catalyst
    D.
    disinfectant.

  3. If L, B and D length, breadth and depth of water in a rectangular sedimentation tank of total discharge Q, the settling velocity, is


  4. In a reservoir the average volume of sediment deposition is 0.15 million cubic per year. If the dead storage and total capacity of the reservoir are 8 million cubic metres and 36 million cubic metres respectively,

  5. A.
    the reservoir will theoretically be silted in 240 years
    B.
    the reservoir will start reducing after 60 years
    C.
    both (a) and (b)
    D.
    neither (a) nor (b).

  6. Q is the discharge from an unconfined tube well with depression head S through a pipe of radius rw. If the radius of influence is R, the minimum required length of the strainer, is


  7. The requirement of water per capita per day, is

  8. A.
    90 litres
    B.
    150 litres
    C.
    250 litres
    D.
    400 litres.

  9. Pick up the incorrect statement from the following. In take of water supply should

  10. A.
    be nearer to the treatment plant
    B.
    receive water from purer zone of the source
    C.
    be located downstream of waste water disposal point
    D.
    remain easily accessible during floods.

  11. Reciprocating pumps

  12. A.
    are not suitable for variable heads
    B.
    are four times costlier than centrifugal pumps
    C.
    are not suitable for pumping water containing sediments
    D.
    single stroke produce pulsating flow
    E.
    none of these.

  13. The temporary hardness of water can be removed by

  14. A.
    boiling
    B.
    adding lime
    C.
    adding alum
    D.
    filtration
    E.
    sedimentation.

  15. Rapid gravity filters

  16. A.
    were developed by G.W. Fullar
    B.
    make use of coarser sand with effective size as 0.5 mm
    C.
    yield as high as 30 times the yield of slow sand filters
    D.
    are fed with coagulation treated water
    E.
    all the above.

  17. If n is porosity, y is specific yield and r is specific retention of any soil, the relationship which holds good, is

  18. A.
    n + y + r = 1
    B.
    n + y = r
    C.
    n + r = y
    D.
    y + r = n
    E.
    n + r + y = 0