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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. Humid volume is the total volume in m3 of 1 kg of

    2. A.
    vapour laden gas at 1 atm. and room temperature.
    B.
    gas plus its accompanying vapour at 1 atm. and room temperature.
    C.
    gas plus its accompanying vapour at 1 atm. and gas temperature.
    D.
    vapour laden gas at 1 atm. and gas temperature.

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  2. Diameter to height ratio for a rashig ring is

    3. A.
    1
    B.
    0.5
    C.
    2
    D.
    8

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  3. The equipment used in the extraction of highly corrosive radio active liquids is

    4. A.
    pulse column
    B.
    spray column
    C.
    mixer settler
    D.
    baffle tower

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  4. Advantage of continuous drying over batch drying is that the

    5. A.
    drying cost per unit weight of dried product is less.
    B.
    product with more uniform moisture content is produced.
    C.
    equipment size required is smaller.
    D.
    all 'a', 'b' & 'c'

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  5. With increase in temperature, the rate of extraction in leaching (solid-liquid extraction system)

    6. A.
    increases
    B.
    decreases
    C.
    remains unaffected
    D.
    increases Linearly

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  6. In a packed bed absorption column, the channelling will be noted by the

    7. A.
    increase in flow rate.
    B.
    sharp drop in pressure drop.
    C.
    sharp rise in pressure drop.
    D.
    none of these.

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  7. Gaseous diffusivity at atmospheric pressure is of the order of __________ cm2/second.

    8. A.
    1
    B.
    1 to 5
    C.
    5 to 10
    D.
    > 10

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  8. In liquid-liquid extraction, the number of phases at plait point is

    9. A.
    1
    B.
    2
    C.
    3
    D.
    4

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  9. In a liquid-liquid extraction, 10 kg of a solution containing 2 kg of solute C and 8 kg of solvent A is brought into contact with 10 kg of solvent B. Solvent A and B are completely immiscible in each other whereas solute C is soluble in both the solvents. The extraction process attains equilibrium. The equilibrium relationship between the two phases is Y* = 0.9X, where Y* is the kg of C/kg of B and X is kg of C/kg of A. Choose the correct answer.

    10. A.
    The entire amount of C is transferred to solvent B.
    B.
    Less than 2 kg but more than 1 kg of C is transferred to solvent B.
    C.
    Less than 1 kg of C is transferred to B.
    D.
    No amount of C is tranferred to B.

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  10. The surface renewal frequency in Danckwerts' model of mass transfer is given by (KL: mass transfer co-efficient)

    11. A.
    KL2.DA
    B.
    KL2.DA
    C.
    KL2/DA
    D.
    KL/DA2

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