Chemical Engineering MCQs

Page No. 646

The diffusivity, DAB (for component A diffusing in B) is equal to the diffusivity DBA (for component B diffusing in A) for a binary mixture of________________?


aNewtonian liquids


bNon-Newtonian liquids


cIdeal gases


dReal gases


View Answer Ideal gases

The expression, ln(F/W) = ∫xF xW [dx/y* – x)] is_____________________?


aDifferential distillation equation


bFor NtoG in absorption for dilute mixture


cSlope of q-line in McCabe-Thiele method


dFor relative volatility



Make up water is required in a cooling tower to replace the water lost by___________________?


aEvaporation


bDrift


cBlowdown and leakage


dAll A., B. and C.


View Answer All A., B. and C.

In a packed tower, the value of HETP equals HTUOG, when the equilibrium and the operating lines are (where, HETP = height equivalent to a theoretical plate HTUOG = overall gas phase height of a transfer unit) ?


aStraight


bParallel


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

In case of a desorber (stripper), the________________?


aOperating line always lies above the equilibrium curve


bOperating line always lies below the equilibrium curve


cTemperature remains unaffected


dTemperature always increases



Desirable value of absorption factor in an absorber is___________________?


a1


b< 1


c> 1


d0.5


View Answer > 1

Leaching of coffee from coffee beans is done by___________________?


aHot water


bHexane


cLime water


dDilute H2SO4 (hot)


View Answer Hot water

If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that___________________?


aThe system comprises of partially miscible liquids


bThe system comprises of miscible liquids


cThe system comprises of an azeotrope


dOn heating, a vapor phase will appear; while on cooling, a solid phase will appear



______________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction ?


aPacked


bBubble


cSpray


dTray


View Answer Bubble

During bottling of cold drinks (e.g. Pepsi), the main resistance to mass transfer for the absorption of carbon dioxide in water lies in the___________________?


aGas film


bLiquid film


cLiquid-gas interface


dNone of these


View Answer Liquid film

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