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Civil Engineering :: Waste Water Engineering

  1. Pick up the correct statement from the following :

  2. A.

    In treated sewage, 4 PPm of D.O. is essential

    B.

    Only very fresh sewage contains some dissolved oxygen

    C.

    The solubility of oxygen in sewage is 95% that is in distilled water

    D.
    All the above.

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  3. In olden days the type of section adopted in trunk and out fall sewers was

  4. A.
    parabolic shaped
    B.

    horse shoe shaped

    C.
    egg shaped
    D.

    circular shaped.

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  5. For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed

  6. A.

    3 PPm

    B.
    4 PPm
    C.

    5 PPm

    D.

    10 ppm.

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  7. In a fully mechanised composting plant, involves

  8. A.

    mechanized receipt

    B.

    mechanized segregation

    C.

    mechanized pulverising of refuse

    D.

    all of these.

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  9. Self-cleansing velocity is

  10. A.

    velocity at dry weather flow

    B.

    velocity of water at flushing

    C.

    velocity at which no accumulation remains in the drains

    D.

    velocity of water in a pressure filter.

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  11. If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is

  12. A.
    2 hours
    B.
    3 hours
    C.

    4 hours

    D.

    5 hours.

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  13. An inverted siphon is designed generally for

  14. A.
    one pipe
    B.

    two pipes

    C.

    three pipes

    D.

    four pipes.

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  15. A rainfall may be classified as acidic if its pH value is less or equal to

  16. A.

    6

    B.

    7

    C.

    5

    D.

    6.5

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  17. When drainage to sewage ratio is 20, the peak dry weather flow is

  18. A.

    20% of the design discharge

    B.

    slightly less than 5% of the design discharge

    C.

    slightly more than 5% of the design discharge

    D.

    none of these.

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  19. For treating the sewage of a large city, you will recommend

  20. A.

    a sedimentation tank and an activated sludge treatment plant

    B.

    a plant consisting of Imhoff tanks with low rate trickling filters

    C.

    sedimentation tanks with high rate trickling filters

    D.

    none of these.

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