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Chemical Engineering :: Mass Transfer

Mass Transfer - Section 1
Mass Transfer - Section 2
Mass Transfer - Section 3
Mass Transfer - Section 4
Mass Transfer - Section 5
Mass Transfer - Section 6
Mass Transfer - Section 7
Mass Transfer - Section 8
Mass Transfer - Section 9
Mass Transfer - Section 10
Mass Transfer - Section 11
Mass Transfer - Section 12
Mass Transfer - Section 13
Mass Transfer - Section 14

  1. Dry bulb temperature of the gas is __________ the wet bulb temperature.

    2. A.
    less than
    B.
    more than
    C.
    equal to
    D.
    none of these

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  2. Decoction refers to the use of solvent

    3. A.
    at ambient temperature
    B.
    at its boiling point
    C.
    in its vapor form
    D.
    none of these

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  3. Flash distillation is suitable for separating the constituents of a binary system, which

    4. A.
    form minimum boiling azeotrope.
    B.
    have very wide boiling points.
    C.
    have very close boiling points.
    D.
    form constant boiling azeotrope.

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  4. The ratio of Murphree plate efficiency to point efficiency is 1 in a __________ flow model.

    5. A.
    plug
    B.
    perfectly mixed
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

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  5. The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm2/sec.

    6. A.
    0.25
    B.
    2.5
    C.
    1.25
    D.
    0.0025

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  6. Flooding in a column results due to

    7. A.
    high pressure drop
    B.
    low pressure drop
    C.
    low velocity of the liquid
    D.
    high temperature

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  7. Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty ?

    8. A.
    Grid tray tower
    B.
    Perforated tray tower
    C.
    Wetted wall tower
    D.
    Bubble cap tower

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  8. A liquid mixture contains 30% o-xylene, 60% p-xylene and 10%. m-xylene (all percentages in w/w). Which of the following statements would be true in respect of this mixture?

    9. A.
    The mixture exhibits an azeotrope at 101.3 kPa.
    B.
    The composition of the mixture, in percent by volume is: o-xylene 30, p-xylene 60. and m-xylene 10.
    C.
    The composition of the mixture in mole percent is: o-xylene 30, p-xylene 60 and m-xyoene 10.
    D.
    The mixture contain optical isomers.

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  9. Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled

    10. A.
    and humidified.
    B.
    and dehumidified with increase in wet bulb temperature.
    C.
    at the same relative humidity.
    D.
    and dehumidified with decrease in wet bulb temperature.

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  10. The process employing desorption of the absorbed solute by a solvent is called

    11. A.
    elution
    B.
    osmosis
    C.
    reverse osmosis
    D.
    sublimation

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