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Chemical Engineering :: Mass Transfer

  1. Mass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases.

  2. A.
    chemical properties
    B.
    physical properties
    C.
    degree of turbulence
    D.
    interfacial area

  3. In a solution containing 0.30 Kg mole of solute and 600 kg of solvent, the molality is

  4. A.
    0.50
    B.
    0.60
    C.
    2
    D.
    1

  5. Fenske equation determines the

  6. A.
    maximum number of ideal plates.
    B.
    height of the distillation column.
    C.
    minimum number of theoretical plates.
    D.
    optimum reflux ratio.

  7. The term "cooling range" in a cooling tower refers to the difference in the temperature of

  8. A.
    cold water leaving the tower and the wet bulb temperature of the surrounding air.
    B.
    hot water entering the tower and the wet bulb temperature of the surrounding air.
    C.
    hot water entering the tower and the cooled water leaving the tower.
    D.
    none of these

  9. Which of the following is the most suitable for extraction in a system having very low density difference ?

  10. A.
    Mixer-settler extractor
    B.
    Centrifugal extractor
    C.
    Pulsed extractor
    D.
    Packed extraction tower

  11. Total reflux in a distillation operation requires minimum

  12. A.
    reboiler load
    B.
    number of plates
    C.
    condenser load
    D.
    all (a), (b) and (c)

  13. The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by

  14. A.
    raising the temperature.
    B.
    lowering the total pressure.
    C.
    both (a) and (b).
    D.
    neither (a) nor (b).

  15. The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is

  16. A.
    +ve
    B.
    -ve
    C.
    zero
    D.
    none of these

  17. Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

  18. A.
    relative volatility is reasonably constant.
    B.
    mixture (to be separated) shows negative deviation from ideality.
    C.
    mixture (to be separated) shows positive deviation from ideality.
    D.
    multicomponent distillation is involved.

  19. When the temperature and humidity of air is low, we usually use __________ draft cooling tower.

  20. A.
    natural
    B.
    forced
    C.
    induced
    D.
    none of these