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Civil Engineering :: Waste Water Engineering

  1. Discrete or granular particles change their

  2. A.

     Size

    B.

     Shape

    C.

     Weight

    D.

     None of these

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  3. The suitable cross-section of sewers to carry combined flow, is

  4. A.

     Circular

    B.

     Egg shaped

    C.

     Rectangular

    D.

     Horse shoe shaped

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  5. Facultative bacteria survive in

  6. A.

     The presence of oxygen

    B.

     The absence of oxygen

    C.

     Both cases A and B

    D.

     Neither A nor B

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  7. A nuisance is experienced in diluting water if dilution factor is less than

  8. A.

     100

    B.

     60

    C.

     40

    D.

     20

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  9. The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is

  10. A.

     5 m

    B.

     5.5 m

    C.

     6.5 m

    D.

     7 m

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

  12. A.

     1045 mm

    B.

     1065 mm

    C.

     1075 mm

    D.

     1095 mm

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  13. The drop man holes are generally provided in sewers for

  14. A.

     Industrial areas

    B.

     Large town ships

    C.

     Hilly town ships

    D.

     Cities in plains

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  15. The flow velocity in detritus tanks is

  16. A.

     0.05 m/sec

    B.

     0.09 m/sec

    C.

     1.25 m/sec

    D.

     None of these

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  17. In normal conditions, the period for sludge digestion, is

  18. A.

     10 days

    B.

     20 days

    C.

     30 days

    D.

     60 days

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  19. The first stage of neutral process of sludge digestion, is

  20. A.

     Acid fermentation

    B.

     Acid regression

    C.

     Alkaline fermentation

    D.

     None of these

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