Chemical Engineering MCQs

Page No. 649

Small dia distillation column can be a _________________________?


aPacked column

✓


bSieve tray

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cBubble cap

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dAny of these

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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

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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

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

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dThe overall M.T.C. of the system

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Low viscosity absorbent is preferred for reasons of ____________________?


aRapid absorption rates and good heat transfer characteristics

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bImproved flooding characteristics

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cLow pressure drop on pumping

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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

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bLiquid side mass transfer co-efficient should be increased

✓


cLiquid side mass transfer co-efficient should be decreased

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dMass transfer co-efficient must be kept constant

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


aAllowable liquid velocity

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bAllowable gas velocity

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cAllowable gas and liquid velocities

✓


dFeed composition

✖



The reciprocal of stripping factor is termed as ________________________?


aSelectivity index

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bRelative volatility

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cAbsorption factor

✓


dMurphree efficiency

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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

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cNot affected by the temperature

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dNone of these

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


a(1 – f)/f

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b– (f – 1)/f

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c-1/f

✓


d-f/(1 – f)

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View Answer -1/f

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


aLewis number

✓


bSchmidt number

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cPrandtl number

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dSherwood number

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View Answer Lewis number

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