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Waste Water Engineering - Section 6
Waste Water Engineering - Section 7
Waste Water Engineering - section-8
  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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  2. The porosity of sediments in sewer pipes, is usually taken as

    3. A.

     0.010
    B.

     0.011
    C.

     0.012
    D.

     0.013

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  3. The sludge does not contain waste water from

    4. A.

     Bath rooms
    B.

     Wash basins
    C.

     Kitchen sinks
    D.

     Toilets

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  4. Dry weather flow is:

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

    6. A.

     Imhoff Cone
    B.

     Turbid meter
    C.

     Potentiometer
    D.

     None of these

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

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

    8. A.

     Average demand
    B.

     Twice the average demand
    C.

     Thrice the average demand
    D.

     Four times the average demand

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

    9. A.

     30 to 40%
    B.

     40 to 60%
    C.

     60 to 80%
    D.

     80 to 90%

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

    10. A.

     Chezy’s formula
    B.

     Bazin’s formula
    C.

     Kutter’s formula
    D.

     Manning’s formula

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

    11. A.

     20 m
    B.

     30 m
    C.

     45 m
    D.

     75 m

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