Top 550+ Solved Mass Transfer MCQ Questions Answer
Q. Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the __________ moisture.
a. Unbound
b. Critical
c. Free
d. Bound
Q. Swenson-Walker crystalliser is a __________ unit.
a. Continuous
b. Batch
c. Semi-batch
d. Cooling (adiabatic)-cum-evaporation
Q. Calculation of mass transfer co-efficient is mostly/normally done using __________ theory.
a. Surface renewal
b. Film
c. Penetration
d. None of these
Q. With increase in temperature, the leaching rate increases because of the
a. Increased diffusivity
b. Decreased viscosity of liquid
c. Both (A) and (B)
d. Neither (A) nor (B)
Q. Relative volatility varies with the concentration of component for an ideal solution. The relative volatility of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of component 'B', when
a. Only vapor phase follows Raoult's law
b. Only liquid phase obeys Dalton's law
c. Liquid phase obeys Dalton's law and vapor phase obeys Raoult's law
d. Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law
Q. Which one of the following devices is not used for both the absorption as well as the liquidliquid extraction processes?
a. Packed towers
b. Plate towers
c. Spray towers
d. Wetted wall columns
Q. Pick out the wrong statement.
a. Mechanical agitation is required, if the system has low interfacial tension
b. Sieve tray towers are generally used for systems having low interfacial tension
c. When Henry's law constant is very small, then the mass transfer rate is controlled by the gas film resistance
d. Taylor-Prandtl analogy for heat and mass tr
Q. For water-ethanol system, the minimum reflux ratio
a. Is computed from the slope of the upper operating line that is tangent to the equilibrium curve
b. Is computed from the intercept of the operating line
c. Cannot be computed
d. Is the optimum reflux ratio
Q. Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation?
a. Cost
b. Availability
c. Toxicity
d. Selectivity
Q. Rayleigh equation applies to __________ distillation.
a. Differential
b. Flash
c. Equilibrium
d. Molecular
Q. In a vapor-liquid contacting equipment, the overall gas phase mass transfer co-efficient (M.T.C), KG is related to individual co-efficients (KG and KL) as
a. KG = 1/KG + m/KL
b. 1/KG = 1/KG + m/KL
c. 1/KG = 1/KL + m/KG
d. KG = 1/KL + m/KG