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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