Chemical Engineering MCQs

Page No. 665

NSc/NPr is called the______________________?


aPsychrometric ratio

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bLewis number

✓


cSherwood number

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dStanton number

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View Answer Lewis number

The Schmidt number which is defined as, μ/ρ D, is the ratio of the_____________________?


aMomentum diffusivity to the mass diffusivity

✓


bThermal diffusivity to the mass diffusivity

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cMomentum diffusivity to the thermal diffusivity

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dNone of these

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An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii) ____________________?


aLess number of trays are required

✓


bComposition of the residue remains unchanged

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cMore number of trays are required but the residue composition remains unchanged

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dMore number of trays are required and the residue composition is more dilute in methanol

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In stripping section of continuous distillation column, the_______________________?


aLiquid is stripped of high boiler

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bLiquid is enriched with high boiler

✓


cVapour is stripped of low boiler

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dNone of these

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The suitable evaporator for concentration of foaming liquids is a ______________________ evaporator?


aLong tube

✓


bShort tube

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cVacuum

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dFalling film

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View Answer Long tube

Mass transfer co-efficient varies as DAB 0.5, according to the _______________ theory?


aFilm

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bSurface renewal

✓


cPenetration

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dNone of these

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View Answer Surface renewal

The solvent used in liquid extraction should not have high latent heat of vaporisation, because ______________________?


aThe pressure drop and hence the pumping cost will be very high

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bIt cannot be recovered by distillation

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cIts recovery cost by distillation may be prohibitively high

✓


dIt will decompose while recovering by distillation

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Absorption accompanied by heat evolution results in____________________?


aIncreased capacity of the absorber

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bIncrease in equilibrium solubility

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cDecrease in equilibrium solubility

✓


dNone of these

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Component A is diffusing in a medium B. The flux NA relative to a stationary point is equal to the flux due to molecular diffusion, if____________________?


aMass transfer is accompanied by reaction

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bDiffusion of A is in stagnant medium B

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cMolecular mean free path is high

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dThere is equimolar counter diffusion

✓



With increase in temperature, the rate of extraction in leaching (solid-liquid extraction system) ?


aIncreases

✓


bRemain unaffected

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cDecreases

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dIncreases Linearly

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View Answer Increases

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