Top 550+ Solved Mass Transfer MCQ Questions Answer
Q. The recovery of penicillin from the acidified fermentation broth is done by
a. Distillation
b. Evaporation
c. Absorption
d. Liquid extraction
Q. Drift in a cooling tower is
a. The water entrained by the circulating air
b. Dependent on the water lost by evaporation
c. Desirable
d. All (A), (B) & (C)
Q. In McCabe-Thiele method, at infinite reflux ratio
a. The overhead product is minimum
b. Both the operating lines coincide with diagonal
c. Both (A) and (B)
d. Neither (A) nor (B)
Q. Gaseous diffusivity at atmospheric pressure is of the order of __________ cm2/second.
a. 1
b. 1 to 5
c. 5 to 10
d. > 10
Q. Pick out the wrong statement.
a. With decrease in feed temperature, the number of plates required for binary distillation decreases for a given ‘L/V’ ratio
b. The extraction per unit of total height for a short packed column is more effective than for a tall column, in case of liquid-liquid extraction
c. Natural draft cooling towers are made of ferroconcrete and its cross-section is wider at the bottom
d. Vander wall adsorption is also called chemisorption
Q. Molarity is defined as the number of gm moles of solute per __________ of solvent.
a. Litre
b. kg
c. gm
d. c.c
Q. If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.
a. 1.2 to 1.5
b. 2.5 to 3
c. 3 to 4
d. 5
Q. Adsorption is a unit operation which generally involves __________ systems.
a. Liquid-solid
b. Gas-solid
c. Fluid-solid
d. Solid-solid
Q. Surface renewal model of mass transfer was enunciated by
a. Toor and Marcello
b. Fick
c. Danckwerts
d. Stefan
Q. Agitator is provided in a crystalliser for
a. Avoiding deposition on cooler surfaces
b. Formation of nuclei
c. Crystal growth
d. All (A), (B) and (C)
Q. Which of the following adsorbent is used to decolourise yellow glycerine?
a. Silica gel
b. Alumina
c. Fuller's earth
d. Activated carbon
Q. Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of
a. Mass diffusivity to momentum diffusivity
b. Thermal diffusivity to mass diffusivity
c. Momentum diffusivity to thermal diffusivity
d. None of these
Q. Binary distillation involves the mass transfer by __________ at the gas-liquid interface.
a. Unidirectional diffusion from liquid to gas phase
b. Unidirectional diffusion from gas to liquid phase
c. Either 'a' or 'b'
d. A counter diffusion at an almost equal molar rate
Q. Corresponding to Nusselt number in heat transfer, the dimensionless group in masstransfer is the __________ number.
a. Sherwood
b. Schmidt
c. Peclet
d. Stanton