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Civil Engineering :: Waste Water Engineering

  1. If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by

  2. A.

     Chezy

    B.

     Manning

    C.

     Bazin

    D.

     Kutter

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  3. In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is

  4. A.

     Q/(B × D)

    B.

     Q/(L × D)

    C.

     Q/L

    D.

     Q/(B × L)

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  5. Maximum permissible velocity 1.5 m/sec, is adopted in drains

  6. A.

     With beds of rocks and gravels

    B.

     Lined with stones

    C.

     Both A. and B.

    D.

     Neither A. nor B.

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  7. Aerobic bacterias

  8. A.

     Flourish in the presence of free oxygen

    B.

     Consume organic matter as their food

    C.

     Oxidise organic matter in sewage

    D.

     All the above

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  9. The quantity of liquid waste which flows in sewers during the period of rainfall, is known

  10. A.

     Sanitary sewage

    B.

     Industrial waste

    C.

     Storm sewage

    D.

     None of these

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  11. To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is

  12. A.

     0.50 m/sec

    B.

     0.60 m/sec

    C.

     0.70 m/sec

    D.

     0.75 m/sec

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  13. Which one of the following gases is most significant as air pollutant?

  14. A.

     Carbondioxide

    B.

     Oxygen

    C.

     Nitrogen

    D.

     Sulphur-dioxide

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  15. The standard B.O.D. of water is taken for

  16. A.

     1 day

    B.

     2 days

    C.

     3 days

    D.

     5 days

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  17. Dried sewage after treatment is used as

  18. A.

     Fertilizer

    B.

     Building material

    C.

     Chemical for lowering B.O.D.

    D.

     Base material for paints

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  19. The sewer which transports the sewage to the point of treatment, is called

  20. A.

     House sewer

    B.

     Out-fall sewer

    C.

     Branch sewer

    D.

     Main sewer

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