Top 550+ Solved Mass Transfer MCQ Questions Answer
Q. Leaching of coarse solid lumps is also termed as
a. Decoction
b. Dissolution
c. Percolation
d. Agitation and settling
Q. 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?
a. Dew point
b. Humidity ratio
c. Wet bulb temperature
d. None of these
Q. Danckwerts developed the __________ theory.
a. Penetration
b. Surface renewal
c. Film
d. None of these
Q. Steam distillation is used to
a. Reduce the number of plates
b. Avoid thermal decomposition of a component
c. Increase the efficiency of separation
d. Increase the total pressure of distillation
Q. When an unsaturated air-water mixture is heated at constant pressure, then
a. The partial pressure of water vapour increases
b. The specific humidity decreases
c. The relative humidity increases
d. The relative humidity decreases
Q. Flash distillation is
a. Same as differential distillation
b. Used for multi-component systems like crude refining
c. Same as simple distillation
d. Most useful for handling binary systems
Q. Mechanism of moisture removal in case of freeze drying of food stuff is by
a. Evaporation
b. Sublimation
c. Dehydration
d. Adsorption
Q. Molality is defined as the number of gm moles of solute per __________ of solvent.
a. Litre
b. gm
c. Kg
d. m3
Q. When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is __________ distillation.
a. Continuous
b. Steam
c. Azeotropic
d. None of these
Q. Alcohol is dehydrated using __________ distillation.
a. Extractive
b. Azeotropic
c. Steam
d. Molecular
Q. Water entrained by circulating air in cooling towers is termed as
a. Drift
b. Blow down
c. Vapor load
d. None of these
Q. Pick out the wrong statement. Raoult's law does not apply, when the
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 non-polar
d. Chemical combination or molecular association between unlike molecules takes place in the formation of solution
Q. Pick out the wrong statement pertaining to the analogy between equations of heat and mass transfer operations.
a. Sherwood number in mass transfer is analogous to Nusselt number in heat transfer
b. Prandtl number in heat transfer is analogous to Schmidt number in mass transfer
c. Reynolds number in mass transfer is analogous to Grashoff number in heat transfer
d. Reynolds number remains the same in both heat and mass transfer
Q. Plate efficiency in a distillation column is reduced due to the __________ of liquid.
a. Entrainment
b. Foaming
c. Weeping & dumping
d. All (A), (B) & (C)