Chemical Engineering MCQs

Page No. 664

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


aDistillation

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bSolvent extraction

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cAbsorption

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dNone of these

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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

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bHelps in increasing the bubble size entering the settler

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cHelps in increasing the settling rate of the bubbles

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dAll ‘a’, ‘b’, & ‘c’

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


aDecreases with time

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bIncreases with time

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cDoes not change with time

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dDoes not affect the moisture content of the wet solid

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


aIncreases

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bDecreases

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cRemains unaffected

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dAnd the heat required in reboiler decreases

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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

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bDecrease

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cRemain same

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dDepend on saturated boiling point; may increase or decrease

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View Answer Increase

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


aSuction pump

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bCompressed air jet

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cSteam jet ejector with a barometric condenser

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dNone of these

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__________________ is concerned with the adsorption equilibria?


aFick’s law

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bGibb’s equation

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cFreundlich equation

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dNone of these

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View Answer Freundlich equation

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


aExtractive distillation

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bCrystallisation

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cAbsorption

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dNone of these

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View Answer Crystallisation

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


aZero

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bHundred

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cBoth zero and hundred

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dNone of these

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View Answer Both zero and hundred

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


aIncrease

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bDecrease

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cRemain unchanged

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dIncrease/decrease; depends on the temperature

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View Answer Increase

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