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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. McCabe-Thiele method

    2. A.
    uses molal units for material and energy balance.
    B.
    uses weight fractions to express liquid and vapour composition.
    C.
    can use any type of units.
    D.
    is more accurate than Ponchan-Savarit method.

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  2. The film penetration model of mass transfer was enunciated by

    3. A.
    Gilliland
    B.
    Toor and Marchello
    C.
    Stefan
    D.
    Fick

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  3. The most economical range of absorption factor is

    4. A.
    0 to 0.5
    B.
    0 to 3
    C.
    1.25 to 2
    D.
    5 to 15

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  4. Channelling is most severe

    5. A.
    in towers packed with stacked packing.
    B.
    in towers packed randomly with crushed solids.
    C.
    in dumped packing of regular units.
    D.
    at very high liquid flow rate.

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  5. Out of two equilibrium curves, first one lies above the diagonal and the second lies below the diagonal in the x-y plot. It means that separation by distillation is

    6. A.
    not possible in the second case unless vacuum is applied.
    B.
    not possible in the second case unless high pressure is applied.
    C.
    more readily done in the second case compared to first one.
    D.
    none of these

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  6. 'ADDUCTS' and 'CLATHRATES' are used in case of

    7. A.
    extractive distillation.
    B.
    crystallisation.
    C.
    absorption.
    D.
    none of these.

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  7. Adsorption is an unit operation which generally involves __________ systems.

    8. A.
    liquid-solid
    B.
    gas-solid
    C.
    fluid-solid
    D.
    solid-solid

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  8. In case of __________ distillation, a solvent is added to alter the relative volatility of the mixture to be separated.

    9. A.
    molecular
    B.
    azeotropic
    C.
    extractive
    D.
    flash.

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  9. Separation of the isotopes of helium for scientific investigations is done by

    10. A.
    reverse osmosis
    B.
    thermal diffusion
    C.
    leaching
    D.
    solvent extraction

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