Chemical Engineering MCQs

Page No. 649

Small dia distillation column can be a _________________________?


aPacked column


bSieve tray


cBubble cap


dAny of these


View Answer Packed column

In a solution containing 0.30 Kg mole of solute and 600 kg of solvent, the molality is_______________________?


a0.50


b0.60


c1


d2


View Answer 0.50

The wetted wall tower is used to determine_________________________?


aIndividual mass transfer co-efficient (M.T.C.) in gaseous system


bM.T.C. of individual components in a liquid-liquid system


cM.T.C. of liquid in liquid-gas system


dThe overall M.T.C. of the system



Low viscosity absorbent is preferred for reasons of ____________________?


aRapid absorption rates and good heat transfer characteristics


bImproved flooding characteristics


cLow pressure drop on pumping


dAll A., B. and C.


View Answer All A., B. and C.

For absorbing a sparingly soluble gas in a liquid ___________________?


aGas side mass transfer co-efficient should be increased


bLiquid side mass transfer co-efficient should be increased


cLiquid side mass transfer co-efficient should be decreased


dMass transfer co-efficient must be kept constant



In distillation columns, the number of bubble caps per tray primarily depends upon the_______________________?


aAllowable liquid velocity


bAllowable gas velocity


cAllowable gas and liquid velocities


dFeed composition



The reciprocal of stripping factor is termed as ________________________?


aSelectivity index


bRelative volatility


cAbsorption factor


dMurphree efficiency


View Answer Absorption factor

Mass transfer co-efficient of liquid is____________________?


aAffected more by temperature than that for gases


bAffected much less by temperature than that for gases


cNot affected by the temperature


dNone of these



If f = moles of vapour present per mole of feed, then the slope of feed line is (McCabe- Thiele method) ________________________?


a(1 – f)/f


b– (f – 1)/f


c-1/f


d-f/(1 – f)


View Answer -1/f

Which of the following plays an important role in problems of simultaneous heat and mass transfer ?


aLewis number


bSchmidt number


cPrandtl number


dSherwood number


View Answer Lewis number

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