Chemical Engineering MCQs

Page No. 682

When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is _______________ distillation?


aContinuous


bSteam


cAzeotropic


dNone of these


View Answer Steam

Mechanism of moisture removal in case of freeze drying of food stuff is by ___________________?


aEvaporation


bSublimation


cDehydration


dAdsorption


View Answer Sublimation

Flash distillation is _______________________?


aSame as differential distillation


bUsed for multi-component systems like crude refining


cSame as simple distillation


dMost useful for handling binary systems



When an unsaturated air-water mixture is heated at constant pressure, then ____________________ ?


aThe partial pressure of water vapour increases


bThe specific humidity decreases


cThe relative humidity increases


dThe relative humidity decreases



Danckwerts developed the ____________________ theory?


aPenetration


bSurface renewal


cFilm


dNone of these


View Answer Surface renewal

Leaching of coarse solid lumps is also termed as _____________________?


aDecoction


bDissolution


cPercolation


dAgitation and settling


View Answer Percolation

Steam distillation is used to__________________?


aReduce the number of plates


bAvoid thermal decomposition of a component


cIncrease the efficiency of separation


dIncrease the total pressure of distillation



Which of the following can be calculated theoretically using steam table and Dalton’s law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known ?


aDew point


bHumidity ratio


cWet bulb temperature


dNone of these


View Answer Wet bulb temperature

In a vapor-liquid contacting equipment, the overall gas phase mass transfer co-efficient (M.T.C), KG is related to individual co-efficients (KG and KL) as ___________________ ?


aKG = 1/KG + m/KL


b1/KG = 1/KG + m/KL


c1/KG = 1/KL + m/KG


dKG = 1/KL + m/KG


View Answer 1/KG = 1/KG + m/KL

Rayleigh equation applies to _________________ distillation ?


aDifferential


bFlash


cEquilibrium


dMolecular


View Answer Differential

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