Chemical Engineering MCQs

Page No. 665

NSc/NPr is called the______________________?


aPsychrometric ratio


bLewis number


cSherwood number


dStanton number


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


cMomentum diffusivity to the thermal diffusivity


dNone of these



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


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


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



In stripping section of continuous distillation column, the_______________________?


aLiquid is stripped of high boiler


bLiquid is enriched with high boiler


cVapour is stripped of low boiler


dNone of these



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


aLong tube


bShort tube


cVacuum


dFalling film


View Answer Long tube

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


aFilm


bSurface renewal


cPenetration


dNone of these


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


bIt cannot be recovered by distillation


cIts recovery cost by distillation may be prohibitively high


dIt will decompose while recovering by distillation



Absorption accompanied by heat evolution results in____________________?


aIncreased capacity of the absorber


bIncrease in equilibrium solubility


cDecrease in equilibrium solubility


dNone of these



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


bDiffusion of A is in stagnant medium B


cMolecular mean free path is high


dThere is equimolar counter diffusion



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


aIncreases


bRemain unaffected


cDecreases


dIncreases Linearly


View Answer Increases

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