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Chemical Engineering :: Mass Transfer

  1. Which of the following parameters remains almost constant during adiabatic saturation of unsaturated air ?

  2. A.
    Dry bulb temperature
    B.
    Dew point
    C.
    Wet bulb temperature
    D.
    None of these

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  3. Coffee is prepared from coffee beans by leaching with

  4. A.
    cold water
    B.
    hot water
    C.
    dilute hot caustic solution
    D.
    naphtha

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  5. Gaseous diffusion co-efficient increases with increase in the

  6. A.
    pressure
    B.
    temperature
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

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  7. With increase in absolute humidity, the dew point of an unsaturated mixture of air and water vapor (at constant pressure and temperature)

  8. A.
    increases
    B.
    remains unchanged
    C.
    decreases
    D.
    decreases linearly

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  9. If xD = overhead product molal composition and RD = reflux ratio, then slope and intercept of the operating line for rectifying section are respectively

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  11. Pick out the wrong statement. Raoult's law does not apply, when the

  12. A.
    size of component molecules are not equal.
    B.
    attractive forces between like and unlike molecules in the solution are approximately equal.
    C.
    component molecules are nonpolar.
    D.
    chemical combination or molecular association between unlike molecules takes place in the formation of solution.

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  13. Water-ethyl alcohal solution can be concentrated (in respect of alcohal concentration) by __________ distillation.

  14. A.
    atmospheric
    B.
    vacuum
    C.
    high pressure
    D.
    none of these

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  15. L/mG is the expression for

  16. A.
    absorption factor
    B.
    Brinkman number
    C.
    slope of operating line in absorber
    D.
    slope of operating line in stripper.

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  17. Extraction of pencillin employs a __________ extraction coloumn.

  18. A.
    centrifugal
    B.
    packed
    C.
    plate
    D.
    None of these.

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  19. In case of gases, the binary diffusivity is proportional to (where, P = pressure)

  20. A.
    P
    B.
    1/P
    C.
    1/P
    D.
    P

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