Chemical Engineering MCQs

Page No. 669

Fractional solvent extraction______________________?


aEmploys only one solvent


bEmploys two solvents


cResults in low interfacial tension


dNone of these


View Answer Employs two solvents

The ratio of Murphree plate efficiency to point efficiency is always > 1 in a _______________ flow model?


aPlug


bPerfectly mixed


cBoth A. & B.


dNeither A. nor B.


View Answer Plug

In a packed bed absorption column, the channelling will be noted by the ____________________?


aIncrease in flow rate


bSharp drop in pressure drop


cSharp rise in pressure drop


dNone of these



Mass transfer co-efficient ‘K’ according to penetration theory varies with mass diffusivity as____________________?


aD0.5


bD


c1/D


dD1.5


View Answer D0.5

A binary mixture of benzene and cyclohexane is separated by___________________?


aFlash vaporisation


bExtractive distillation


cSolvent extraction


dOrdinary distillation



Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the____________________?


aPacking may be crushed due to thermal expansion/contraction of the components of the equipments


bPressure drop in the equipment will be very high


cViscosity variation of the fluids may cause channelling/flooding


dNone of these



The expression, y(1 – x)/x(1 – y) is for_____________________?


aAbsorption factor


bRelative volatility


cSelectivity


dMurphree efficiency


View Answer Relative volatility

In McCabe-Thiele method, at infinite reflux ratio___________________?


aNumber of plates is maximum


bOverhead product is maximum


cBoth the operating lines coincide with the diagram


dNone of these



Weeping in a distillation column_____________________?


aIncreases tray efficiency


bProvides large interfacial surface for mass transfer


cResults due to very high gas velocity


dResults due to very low gas velocity



The ratio of Murphree plate efficiency to point efficiency is 1 in a ______________________ flow model?


aPlug


bPerfectly mixed


cBoth A. & B.


dNeither A. nor B.


View Answer Perfectly mixed

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