Chemical Engineering MCQs

Page No. 663

When the solvent dissolves very little of solute, then__________________________?


aSolvent of low latent heat of vaporisation should be used


bSolvent of low freezing point should be used


cLarge quantity of solvent is required to extract the solute


dVery small quantity of solvent is required



Tea percolation employs___________________________?


aLiquid-liquid extraction


bLeaching


cAbsorption


dNone of these


View Answer Leaching

The equipment used in the extraction of highly corrosive radioactive liquids is_______________________?


aPulse column


bSpray column


cMixer settler


dBaffle tower


View Answer Pulse column

With increase in temperature, the solubility of gases in liquids, at fixed pressure____________________?


aIncreases


bDecreases


cRemain same


dEither A. or B., depends on the system


View Answer Decreases

Degree of freedom for leaching and solvent extraction process is_____________________?


a0


b1


c2


d3


View Answer 3

Unit operation involved in the prilling of urea is_____________________?


aEvaporation


bDrying


cCrystallisation


dBoth B. and C.


View Answer Both B. and C.

In physical terms, Schmidt number means _________________?


aThermal diffusivity/mass diffusivity


bThermal diffusivity/momentum diffusivity


cMomentum diffusivity/mass diffusivity


dMass diffusivity/thermal diffusivity



At __________________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation?


aOperating


bTotal


cMinimum


dMaximum permissible


View Answer Total

In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________________ its relative saturation?


aLower than


bHigher than


cEqual to


dEither A. or B., depends on the mixture composition


View Answer Lower than

Flash distillation is suitable for separating the constituents of a binary system, which _____________________?


aForm minimum boiling azeotrope


bHave very wide boiling points


cHave very close boiling points


dForm constant boiling azeotrope



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