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Civil Engineering :: Waste Water Engineering

  1. Dilution method of disposing off sewage, is not preferred to

  2. A.

    when sewage is fresh

    B.

    when diluting water has high dissolved oxygen content

    C.

    when diluting water is used for water supply near the point of sewage disposed

    D.
    when the diluting water is having flow currents
    E.

    none of these.


  3.  

    For house drainage minimum gradient is

  4. A.

    1 in 60

    B.

    1 in 80

    C.
    1 in 10
    D.

    1 in 400


  5. If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is

  6. A.

    1045 mm

    B.
    1065 mm
    C.

    1075 mm

    D.

    1095 mm.


  7. The ratio of minimum hourly flow to the average flow of sewage is

  8. A.

    1/4

    B.

    1/3

    C.
    1/2
    D.

    3/4


  9. Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to

  10. A.

    initial demand

    B.

    first stage demand

    C.
    carbonaceous demand
    D.

    all of these.


  11. Flocculated particles do not change their

  12. A.

    size

    B.

    shape

    C.
    weight
    D.

    none of these.


  13.  

    For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is

  14. A.

    cast iron sewers

    B.

    cement concrete sewers

    C.

    glazed bricks sewers

    D.

    stone ware sewers.


  15. Disposal to sewage in large cities, is done in

  16. A.
    irrigation
    B.

    dilution

    C.
    oxidation
    D.

    putrifaction.


  17. For the COD test of sewage, organic matter is oxidised by K2Cr207 in the presence of

  18. A.

    H2SO4

    B.

    HNO3

    C.

    HCl

    D.
    none of these.

  19.  

    In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept

  20. A.
    10.0
    B.
    5.0
    C.
    2.0
    D.

    0.25