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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. Equilibrium-moisture curves of different solids

    2. A.
    are different
    B.
    are same
    C.
    depend on the humidity of the gas
    D.
    none of these

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  2. Azeotropism for ethyl alcohol-water system disappears by

    3. A.
    increasing temperature
    B.
    decreasing pressure
    C.
    increasing pressure
    D.
    no means

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  3. Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the

    4. A.
    mass transfer co-efficient.
    B.
    thermal diffusivity.
    C.
    kinematic viscosity.
    D.
    volumetric diffusivity.

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  4. Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture ?

    5. A.
    Anthracite coal
    B.
    Rag paper
    C.
    Bamboo
    D.
    Inorganic solids

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  5. In the absorption of ammonia in water, the main resistance to absorption is by the __________ phase.

    6. A.
    liquid
    B.
    gas
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

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  6. Drying of refractory is normally carried out in a __________ dryer.

    7. A.
    open pan
    B.
    tray
    C.
    rotary vacuum
    D.
    truck/tunnel.

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  7. The expression, ln(F/W) = is

    8. A.
    differential distillation equation
    B.
    for NtoG in absorption for dilute mixture
    C.
    slope of q-line in McCabe-Thiele method
    D.
    for relative volatility

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  8. Heat sensitive materials with very high latent heat of vaporisation may be economically separated using

    9. A.
    liquid extraction
    B.
    distillation
    C.
    evaporation
    D.
    absorption

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  9. When the solvent dissolves very little of solute, then

    10. A.
    solvent of low latent heat of vaporisation should be used.
    B.
    solvent of low freezing point should be used.
    C.
    large quantity of solvent is required to extract the solute.
    D.
    very small quantity of solvent is required.

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  10. An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is

    11. A.
    9.21
    B.
    4.605
    C.
    100
    D.
    0.001

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