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Civil Engineering :: Waste Water Engineering

  1. The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known

  2. A.

     Bio-Chemical Oxygen Demand (B.O.D.)

    B.

     Dissolved Oxygen (D.O.)

    C.

     Chemical Oxygen Demand (C.O.D.)

    D.

     None of these

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  3. Removal of oil and grease from sewage, is known

  4. A.

     Screening

    B.

     Skimming

    C.

     Filtration

    D.

     None of these

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  5. Are available in size Stoneware sewers

  6. A.

     10 cm

    B.

     15 cm

    C.

     20 cm

    D.

     All the above

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  7. Oxidation process results in the formation of

  8. A.

     Carbon dioxide

    B.

     Nitrates

    C.

     Sulphates

    D.

     All the above

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  9. The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be

  10. A.

     0.9 cm

    B.

     1.2 m

    C.

     1.5 m

    D.

     > 1.5 m

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  11. A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is

  12. A.

     0.30 m/sec

    B.

     0.35 m/sec

    C.

     0.40 m/sec

    D.

     0.45 m/sec

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  13. In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is

  14. A.

     [(100 + P1)/(100 – P2)] V1

    B.

     [(100 – P1)/(100 + P2)] V1

    C.

     [(100 – P1)/(100 – P2)] V1

    D.

     [(100 + P2)/(100 – P1)] V1

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  15. The minimum diameter of sewer to be adopted is

  16. A.

     10 cm

    B.

     12.5 cm

    C.

     15 cm

    D.

     25 cm

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  17. In a grit chamber of a sewage treatment plant,

  18. A.

     Flow velocity 0.15 m to 0.3 m/sec is kept

    B.

     Depth of 0.9 m to 1.20 m is kept

    C.

     One minute of detention period is kept

    D.

     All the above

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  19. In a trickling filter

  20. A.

     Filtration process is used

    B.

     Biological action is used

    C.

     Neither A nor B

    D.

     Both A and B

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