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

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bSteam

✓


cAzeotropic

✖


dNone of these

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View Answer Steam

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


aEvaporation

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bSublimation

✓


cDehydration

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dAdsorption

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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

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


aThe partial pressure of water vapour increases

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bThe specific humidity decreases

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cThe relative humidity increases

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dThe relative humidity decreases

✓



Danckwerts developed the ____________________ theory?


aPenetration

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bSurface renewal

✓


cFilm

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dNone of these

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View Answer Surface renewal

Leaching of coarse solid lumps is also termed as _____________________?


aDecoction

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bDissolution

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cPercolation

✓


dAgitation and settling

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View Answer Percolation

Steam distillation is used to__________________?


aReduce the number of plates

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bAvoid thermal decomposition of a component

✓


cIncrease the efficiency of separation

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dIncrease the total pressure of distillation

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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

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bHumidity ratio

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cWet bulb temperature

✓


dNone of these

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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

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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

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cEquilibrium

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dMolecular

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View Answer Differential

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