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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. Which of the following equipments is not used for gas dispersion ?

    2. A.
    Agitated vessels
    B.
    Bubble cap tray towers
    C.
    Perforated sieve tray towers
    D.
    Spray towers

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  2. One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult's law is obeyed, then changing the feed composition would effect

    3. A.
    the product composition but not the fraction vaporised.
    B.
    the product composition as well as the fraction vaporised.
    C.
    the fraction vaporised but not the product composition.
    D.
    neither the product composition nor the fraction vaporised.

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  3. The equation, is for

    4. A.
    steady state equimolar counter diffusion
    B.
    Fick's first law of diffusion
    C.
    steady state diffusion for stagnant case
    D.
    liquid M.T.C. by penetration theory.

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  4. With increase in the liquid flow rate at a fixed gas velocity in a randomly packed counter current gas-liquid absorption column, the gas pressure drop

    5. A.
    decreases
    B.
    remains unchanged
    C.
    increases
    D.
    decreases exponentially

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  5. The equation, is for

    6. A.
    Fick's second law of diffusion.
    B.
    stready state diffusion for stagnant case.
    C.
    liquid M.T.C. by Higbie penetration theory.
    D.
    none of these.

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  6. Which of these columns incurs the lowest pressure drop ?

    7. A.
    Packed column (with stacked packing)
    B.
    Packed column (with dumped packing)
    C.
    Bubble plate column
    D.
    Pulse column

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  7. In the desorption of highly soluble gas from the liquid, the main resistance will be in the __________ phase.

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

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  8. If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is

    9. A.
    L/G
    B.
    G/L
    C.
    always < 1
    D.
    none of these

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  9. Which of the following remains constant during evaporative cooling process with recirculated water supply ?

    10. A.
    Relative humidity
    B.
    Partial pressure of vapour
    C.
    Wet bulb temperature
    D.
    None of these

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  10. For stripping of a gas in a counter current stripper, the operating line

    11. A.
    lies above the equilibrium curve.
    B.
    lies below the equilibrium curve.
    C.
    can lie above or below the equilibrium curve.
    D.
    is always parallel to the equilibrium curve.

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