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Home Chemical Engineering Mass Transfer Comments

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


  • Options
  • 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.

  • Correct Answer
  • relative volatility is reasonably constant. 


  • Mass Transfer problems


    Search Results


    • 1. Absorption factor is defined as (where, S1 = slope of the operating line S2 = slope of the equilibrium curve)

    • Options
    • A. S2/S1
    • B. S1/S2
    • C. S1 - S2
    • D. S1 x S2
    • Discuss
    • 2. The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is

    • Options
    • A. +ve
    • B. -ve
    • C. zero
    • D. none of these
    • Discuss
    • 3. The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = __________

    • Options
    • A. 1
    • B. 0.5
    • C. 10
    • D. 0
    • Discuss
    • 4. In distillation columns, the number of bubble caps per tray primarily depends upon the

    • Options
    • A. allowable liquid velocity.
    • B. allowable gas velocity.
    • C. allowable gas and liquid velocities.
    • D. feed composition.
    • Discuss
    • 5. The term "cooling range" in a cooling tower refers to the difference in the temperature of

    • Options
    • 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
    • Discuss
    • 6. Which of the following is the most suitable for extraction in a system having very low density difference?

    • Options
    • A. Mixer-settler extractor
    • B. Centrifugal extractor
    • C. Pulsed extractor
    • D. Packed extraction tower
    • Discuss
    • 7. Low viscosity absorbent is preferred for reasons of

    • Options
    • A. rapid absorption rates and good heat transfer characteristics.
    • B. improved flooding characteristics.
    • C. low pressure drop on pumping.
    • D. all (a), (b) and (c).
    • Discuss
    • 8. Raoult's law applies to the

    • Options
    • A. all liquid solutions
    • B. non-ideal solution only.
    • C. non-volatile solute.
    • D. solvents.
    • Discuss
    • 9. Which of the following quantities need not be fixed before starting the design of a co-current absorber?

    • Options
    • A. Heat gain or loss
    • B. Flow rate of entering liquid
    • C. Flow rate of gas
    • D. None of these
    • Discuss
    • 10. Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the __________ of a fibre.

    • Options
    • A. electrical resistance
    • B. thermal conductivity
    • C. strength
    • D. none of these.
    • Discuss


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