Chemical Engineering MCQs

Page No. 683

What is the degree of freedom of an absorption process in which only one component is transferred between phases ?


a1


b2


c3


d4


View Answer 3

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 ?


aCost


bAvailability


cToxicity


dSelectivity


View Answer Selectivity

At 750°K and 1 atm, the approximate value of Schmidt number for air is_________________?


a0.01


b0.1


c1


d10


View Answer 0.1

For water-ethanol system, the minimum reflux ratio_____________________?0For water-ethanol system, the minimum reflux ratio_____________________?


aIs computed from the slope of the upper operating line that is tangent to the equilibrium curve


bIs computed from the intercept of the operating line


cCannot be computed


dIs the optimum reflux ratio



Penetration theory relates the average mass transfer co-efficient (K) with diffusivity D. as____________________?


aK ∝D


bK ∝√D


cK ∝D1.5


dK ∝D2


View Answer K ∝√D

Which one of the following devices is not used for both the absorption as well as the liquidliquid extraction processes ?


aPacked towers


bPlate towers


cSpray towers


dWetted wall columns


View Answer Wetted wall columns

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_________________?


aOnly vapor phase follows Raoult’s law


bOnly liquid phase obeys Dalton’s law


cLiquid phase obeys Dalton’s law and vapor phase obeys Raoult’s law


dVapor phase obeys Dalton’s law and liquid phase obeys Raoult’s law



Calculation of mass transfer co-efficient is mostly/normally done using ______________ theory?


aSurface renewal


bFilm


cPenetration


dNone of these


View Answer Film

With increase in temperature, the leaching rate increases because of the _____________________?


aIncreased diffusivity


bDecreased viscosity of liquid


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

For a binary mixture distillation process, the degree of freedom is 2. However, if the pressure is fixed in this process, the number of independent variables in this process will be ___________________?


a1


b0


c2


d3


View Answer 1

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