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

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cKinematic viscosity

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dVolumetric diffusivity

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


a< 1 and ≈ 1

✓


b1 and 0

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c> 1 and ≈ 1

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d0 and ≈ 1

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View Answer < 1 and ≈ 1

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


aIncrease in rate of drying

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bIncreasing temperatures both on the surface and within the solid

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cDecreasing temperatures

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dNone of these

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Azeotropism for ethyl alcohol-water system disappears by_____________________?


aIncreasing temperature

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bDecreasing pressure

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cIncreasing pressure

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dNo means

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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

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

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cLess than 1 kg of C is transferred to B

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dNo amount of C is transferred to B

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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

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b8

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c9

✓


d10

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View Answer 9

Sand is dried in foundries in a ______________________drier?


aRotary

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bFluidised bed

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cVacuum

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dSpray

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View Answer Fluidised bed

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


aUnidirectional diffusion from liquid to gas phase

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bUnidirectional diffusion from gas to liquid phase

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cEither A. or B.

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dA counter diffusion at an almost equal molar rate

✓



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


aSilica gel

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bAlumina

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cFuller’s earth

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dActivated carbon

✓


View Answer Activated carbon

Surface renewal model of mass transfer was enunciated by___________________?


aToor and Marcello

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bFick

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cDanckwerts

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dStefan

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View Answer Danckwerts

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