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Chemical Engineering :: Mass Transfer

  1. When the gas to be dissolved in liquid is a/an __________ then normally co-current adsorber are used.

  2. A.
    mixture of two gases
    B.
    pure gas
    C.
    ideal gas
    D.
    sparingly soluble gas

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  3. Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the __________ number.

  4. A.
    Schmidt
    B.
    Sherwood
    C.
    Peclet
    D.
    Stanton

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  5. If a two phase system is in physical equilibrium; then it means that, the

  6. A.
    escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase.
    B.
    temperature of the liquid phase is equal to that of the vapor phase.
    C.
    total pressure throughout the liquid phase is equal to that throughout the vapor phase.
    D.
    all (a), (b) and (c).

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  7. McCabe-Thiele method of binary distillation does not assume that the

  8. A.
    sensible heat changes are negligible compared with latent heat changes.
    B.
    molar latent heats of all components are equal.
    C.
    heat of mixing is negligible.
    D.
    none of these

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  9. (NSh/NRe.NSc) is termed in mass transfer operation as the

  10. A.
    Stanton number
    B.
    Peclet number
    C.
    thermal diffusivity
    D.
    momentum diffusivity

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  11. The Hatta number is important in

  12. A.
    multicomponent distillation.
    B.
    binary distillation.
    C.
    gas absorption without chemical reaction.
    D.
    gas absorption with chemical reaction.

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  13. When a multistage tray tower uses a minimum reflux ratio, it implies

  14. A.
    infinite trays and maximum reboiler heat load.
    B.
    infinite trays and minimum reboiler heat load.
    C.
    minimum trays and minimum reboiler heat load.
    D.
    minimum trays and maximum reboiler heat load

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  15. CO2 can be absorbed by

  16. A.
    hot cupric oxide
    B.
    heated charcoal
    C.
    cold Ca(OH)2
    D.
    alumina

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  17. For the same process conditions, the reflux ratio of an unlagged distillation column

  18. A.
    decreases in winter
    B.
    increases in winter
    C.
    increases in summer
    D.
    none of these

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  19. An ideal tower packing should not

  20. A.
    have low weight per unit volume.
    B.
    have large surface area per unit volume.
    C.
    have large free cross-section.
    D.
    hold up large amount of liquid in the packing.

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