Chemical Engineering MCQs

Page No. 658

Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the_________________?


aMass transfer co-efficient


bThermal diffusivity


cKinematic viscosity


dVolumetric diffusivity



Schmidt number and Lewis number for pure air at atmospheric conditions are respectively__________________?


a< 1 and ≈ 1


b1 and 0


c> 1 and ≈ 1


d0 and ≈ 1


View Answer < 1 and ≈ 1

The falling rate period in the drying of a solid is characterised by__________________?


aIncrease in rate of drying


bIncreasing temperatures both on the surface and within the solid


cDecreasing temperatures


dNone of these



Azeotropism for ethyl alcohol-water system disappears by_____________________?


aIncreasing temperature


bDecreasing pressure


cIncreasing pressure


dNo means


View Answer Decreasing pressure

In a liquid-liquid extraction, 10 kg of a solution containing 2 kg of solute C and 8 kg of solvent A is brought into contact with 10 kg of solvent B. Solvent A and B are completely immiscible in each other whereas solute C is soluble in both the solvents. The extraction process attains equilibrium. The equilibrium relationship between the two phases is Y* = 0.9X, where Y* is the kg of C/kg of B and X is kg of C/kg of A. Choose the correct answer?


aThe entire amount of C is transferred to solvent B


bLess than 2 kg but more than 1 kg of C is transferred to solvent B


cLess than 1 kg of C is transferred to B


dNo amount of C is transferred to B



Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are ?


a4


b8


c9


d10


View Answer 9

Sand is dried in foundries in a ______________________drier?


aRotary


bFluidised bed


cVacuum


dSpray


View Answer Fluidised bed

Binary distillation involves the mass transfer by ______________________ at the gas-liquid interface?


aUnidirectional diffusion from liquid to gas phase


bUnidirectional diffusion from gas to liquid phase


cEither A. or B.


dA counter diffusion at an almost equal molar rate



Which of the following adsorbent is used to decolourise yellow glycerine ?


aSilica gel


bAlumina


cFuller’s earth


dActivated carbon


View Answer Activated carbon

Surface renewal model of mass transfer was enunciated by___________________?


aToor and Marcello


bFick


cDanckwerts


dStefan


View Answer Danckwerts

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