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Home Chemical Engineering Mass Transfer Comments

  • Question
  • Physical absorption is


  • Options
  • A. an irreversible phenomenon.
  • B. a reversible phenomenon.
  • C. accompanied by evolution of heat.
  • D. both (b) and (c)

  • Correct Answer
  • both (b) and (c) 


  • Mass Transfer problems


    Search Results


    • 1. Absorption accompanied with chemical reaction is exemplified by the absorption of

    • Options
    • A. ammonia in water.
    • B. benzol present in coke oven gas by wash oil.
    • C. SO2 in alkaline solution.
    • D. all (a), (b) and (c).
    • Discuss
    • 2. 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
    • 3. 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
    • 4. Raoult's law applies to the

    • Options
    • A. all liquid solutions
    • B. non-ideal solution only.
    • C. non-volatile solute.
    • D. solvents.
    • Discuss
    • 5. 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
    • 6. In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG __________ the absorption factor.

    • Options
    • A. increases with increase in
    • B. is one at unity value of
    • C. both (a) and (b)
    • D. neither (a) nor (b)
    • Discuss
    • 7. Make up water is required in a cooling tower to replace the water lost by

    • Options
    • A. evaporation
    • B. drift
    • C. blowdown and leakage
    • D. all (a), (b) and (c)
    • Discuss
    • 8. Pick out the correct statement.

    • Options
    • A. In case of liquid-liquid extraction, no separation is possible, if the selectivity of the solvent used is unity.
    • B. With increase in temperature, the selectivity of the solvent used in solvent extraction decreases.
    • C. The selectivity of solvent used in solvent extraction is unity at the plait point.
    • D. all (a), (b) and (c).
    • Discuss
    • 9. Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as

    • Options
    • A. K ? D
    • B. K ?D
    • C. K ? D1.5
    • D. K ? D2
    • Discuss
    • 10. Fenske equation determines the

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


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