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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


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

  4. A.

     Circular

    B.

     Egg shaped

    C.

     Rectangular

    D.

     Horse shoe shaped


  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


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

  8. A.

     100

    B.

     60

    C.

     40

    D.

     20


  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


  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


  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


  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


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

  18. A.

     10 days

    B.

     20 days

    C.

     30 days

    D.

     60 days


  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