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Chemical Engineering :: Mass Transfer

  1. __________ is used as an 'entrainer' for the separation of acetic acid-water mixture by distillation.

  2. A.
    Furfural
    B.
    Benzol
    C.
    Butyl acetate
    D.
    Hexane

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  3. Rotary dryers cannot handle __________ materials.

  4. A.
    free flowing
    B.
    dry
    C.
    sticky
    D.
    grannular

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  5. Pick out the correct statement.

  6. A.
    Diffusivity decreases with increase in temperature.
    B.
    Diffusivity increases with increase in molecular weight.
    C.
    Diffusivity increases with the size of the individual molecule.
    D.
    none of these.

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  7. An example of elutioh is

  8. A.
    separation of uranium oxide from its ore by H2SO4 in a Pachuca tank.
    B.
    separation of sugar from sugar beet by hot water.
    C.
    dissolution of tannin out of tree barks by water.
    D.
    recovery of vegetable oils from seeds.

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  9. The operating line for an absorber is curved, when plotted in terms of

  10. A.
    mole fractions
    B.
    mole ratios
    C.
    partial pressure
    D.
    mass fractions

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  11. Relative volatility does not change appreciably with the change in

  12. A.
    temperature
    B.
    vapour pressure of either component
    C.
    total pressure
    D.
    none of these

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  13. Boiling point diagram is not affected by the ambient

  14. A.
    pressure
    B.
    humidity
    C.
    temperature
    D.
    both (b) and (c)

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  15. The dew point of a saturated gas phase equals the __________ temperature.

  16. A.
    gas
    B.
    room
    C.
    wet bulb
    D.
    none of these

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  17. A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process ?

  18. A.
    Flow rate of inlet air
    B.
    Relative humidity of outlet air
    C.
    Humidity of inlet air
    D.
    Temperature of the solid

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  19. In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the

  20. A.
    temperature and pressure
    B.
    concentration
    C.
    nature of the constituents
    D.
    none of these

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