Chemical Engineering MCQs

Page No. 664

In which of the following unit operations, the selectivity is an important parameter ?


aDistillation


bSolvent extraction


cAbsorption


dNone of these


View Answer Solvent extraction

A coalescer in a mixer-settler liquid-liquid extraction column______________________?


aComprises of thin bed of substances of extended surface having high porosity


bHelps in increasing the bubble size entering the settler


cHelps in increasing the settling rate of the bubbles


dAll ‘a’, ‘b’, & ‘c’



During constant rate drying period, vaporisation rate per unit drying surface area _____________________?


aDecreases with time


bIncreases with time


cDoes not change with time


dDoes not affect the moisture content of the wet solid



In a distillation column, with increase in the reflux ratio, the heat removed in the cooler ______________________?


aIncreases


bDecreases


cRemains unaffected


dAnd the heat required in reboiler decreases


View Answer Increases

The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will______________________?


aIncrease


bDecrease


cRemain same


dDepend on saturated boiling point; may increase or decrease


View Answer Increase

In most of the vacuum crystalliser, vacuum is generally produced by means of a_____________________?


aSuction pump


bCompressed air jet


cSteam jet ejector with a barometric condenser


dNone of these



__________________ is concerned with the adsorption equilibria?


aFick’s law


bGibb’s equation


cFreundlich equation


dNone of these


View Answer Freundlich equation

‘ADDUCTS’ and ‘CLATHRATES’ are used in case of_____________________?


aExtractive distillation


bCrystallisation


cAbsorption


dNone of these


View Answer Crystallisation

The percentage humidity is less than the relative humidity only at __________________ percent humidity?


aZero


bHundred


cBoth zero and hundred


dNone of these


View Answer Both zero and hundred

At constant pressure, with increase of temperature, the dew point will ________________________?


aIncrease


bDecrease


cRemain unchanged


dIncrease/decrease; depends on the temperature


View Answer Increase

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