Chemical Engineering MCQs

Page No. 688

In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raffinate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg) ?


a6.89


b8.89


c10


d8.25


View Answer 8.89

Dried finished product sampled from various parts of a ________________ dryer exhibits nonuniformity in the moisture content?


aRotary


bTray


cFreeze


dNone of these


View Answer Tray

In steam distillation, the _____________________?


aTemperature is 100°C


bTemperature is more than 100° C


cProduct must be immiscible with water


dTemperature is higher than the boiling point of either component



A slurry is to be dried to produce flaky solid. Which dryer would you recommend ?


aSpray dryer


bDrum dryer


cRotary dryer


dDielectric dryer


View Answer Spray dryer

Which of the following parameters remains constant during chemical dehumidification ?


aDry bulb temperature


bPartial pressure of vapour


cWet bulb temperature


dNone of these


View Answer Dry bulb temperature

Coffee is prepared from coffee beans by leaching with____________________?


aCold water


bHot water


cDilute hot caustic solution


dNaphtha


View Answer Hot water

The equation, NA = (DAB . Pt /RTZ) (y1 – y2) is for _______________________?


aSteady state equimolar counter diffusion


bFick’s first law of diffusion


cSteady state diffusion for stagnant case


dLiquid M.T.C. by penetration theory



Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and ‘t’ is time) ?


a(De.t)1/2


b(De/t)1/2


c(4De/πt)1/2


d(4De/t)


View Answer (4De/πt)1/2

The relative volatility of a binary mixture at the Azeotropic composition is _______________________?


a1


b> 1


c0


d


View Answer 1

For absorbing a sparingly soluble gas in a liquid, the_____________________?


aGas side co-efficient should be increased


bLiquid side coefficient should be increased


cGas side co-efficient should be decreased


dLiquid side co-efficient should be decreased



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