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Chemical Engineering :: Mass Transfer

  1. As the reflux ratio increases, the slope of the operating line for rectifying section

  2. A.
    increases
    B.
    decreases
    C.
    remains constant
    D.
    data insufficient, cannot be predicted

  3. Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature)

  4. A.
    log P vs . T
    B.
    log P vs. log T
    C.
    T vs . P
    D.
    P vs . log T

  5. The unit of volumetric diffusivity is

  6. A.
    cm2/sec
    B.
    cm/sec
    C.
    cm3/sec
    D.
    cm2/sec2

  7. For a ternery mixture, in which equilateral triangular co-ordinate is used in leaching and extraction, a __________ of the equilateral triangular co-ordinates.

  8. A.
    binary mixture is represented by the apex
    B.
    binary mixture is represented by any point inside
    C.
    ternery mixture is represented by the sides
    D.
    pure component is represented by the apex.

  9. Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called the __________ temperature.

  10. A.
    dry-bulb
    B.
    wet-bulb
    C.
    dew point
    D.
    adiabatic saturation

  11. The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same sytem is

  12. A.
    100
    B.
    10
    C.
    5
    D.
    1

  13. The slope of 9-line is determined by the

  14. A.
    reflux ratio
    B.
    plate efficiency to be achieved
    C.
    thermal condition of the feed
    D.
    relative volatility.

  15. In steam distillation, the

  16. A.
    temperature is 100°C.
    B.
    temperature is more than 100° C.
    C.
    product must be immiscible with water.
    D.
    temperature is higher than the boiling point of either component.

  17. Which of the following can be calculated theoretically using steam table and Dalton's law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known ?

  18. A.
    Dew point
    B.
    Humidity ratio
    C.
    Wet bulb temperature
    D.
    None of these