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Civil Engineering :: Waste Water Engineering

  1. The sewage treatment units in which anaerobic decomposition of organic matter is used, are called

  2. A.

     Imhoff tanks

    B.

     Trickling filters

    C.

     Sludge sedimentation tanks

    D.

     None of these

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  3. The porosity of sediments in sewer pipes, is usually taken as

  4. A.

     0.010

    B.

     0.011

    C.

     0.012

    D.

     0.013

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  5. The sludge does not contain waste water from

  6. A.

     Bath rooms

    B.

     Wash basins

    C.

     Kitchen sinks

    D.

     Toilets

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  7. Dry weather flow is:

  8. A.

     Average daily rate of flow

    B.

     Average monthly rate of flow

    C.

     Average annual rate of flow

    D.

     Water supply allowance per capita

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  9. The pH value of sewage is determined with the help of

  10. A.

     Imhoff Cone

    B.

     Turbid meter

    C.

     Potentiometer

    D.

     None of these

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  11. Drop manholes at the junctions of sewer lines, are provided if

  12. A.

     Invert level of a branch sewer is more than 60 cm that of the main sewer

    B.

     Sewer line runs along a main road

    C.

     Ordinary manhole cannot be built

    D.

     Two sewer lines intersect

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  13. It is customary to design a sewer for D.W.F. on the basis of

  14. A.

     Average demand

    B.

     Twice the average demand

    C.

     Thrice the average demand

    D.

     Four times the average demand

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  15. In trickling filter, B.O.D. is reduced to

  16. A.

     30 to 40%

    B.

     40 to 60%

    C.

     60 to 80%

    D.

     80 to 90%

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  17. The value of Chezy’s constant C = 157.6/(1.81 + K/ ) is used in

  18. A.

     Chezy’s formula

    B.

     Bazin’s formula

    C.

     Kutter’s formula

    D.

     Manning’s formula

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  19. The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is

  20. A.

     20 m

    B.

     30 m

    C.

     45 m

    D.

     75 m

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