Chemical Engineering MCQs

Page No. 582

What is the dispersion number for a CSTR ?


a0

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b1

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c< 1

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d∞

✓


View Answer ∞

Following isothermal kinetic data are obtained in a basket type of mixed flow reactor for a porous catalyst. Determine the role of pore diffusion and external mass transfer processes ?


aStrong pore diffusion control and mass transfer not controlling

✓


bBoth pore diffusion and mass transfer not controlling

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cBoth pore diffusion and mass transfer controlling

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dMass transfer controlling

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Catalyst is a substance, which ________________ chemical reaction?


aIncreases the speed of a

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bDecreases the speed of a

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cCan either increase or decrease the speed of a

✓


dAlters the value of equilibrium constant in a reversible

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_____________ gas is normally employed in B.E.T. method of finding out the surface area of catalyst?


aN2

✓


bH2

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cCO2

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dHe

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View Answer N2

The equilibrium constant of a catalytic chemical reaction _______________ due to the presence of?


aIncreases

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bDecreases

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cRemain unaffected

✓


dUnpredictable from the data

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View Answer Remain unaffected

A second order liquid phase reaction, A → B, is carried out in a mixed flow reactor operated in semi batch mode (no exit stream). The reactant A at concentration CAF is fed to the reactor at a volumetric flow rate of F. The volume of the reacting mixture is V and the density of the liquid mixture is constant. The mass balance for A is_______________________?


ad(VCA)/dt = -F (CAF – CA) – kCA2V

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bd(VCA)/dt = F (CAF – CA) – kCA2V

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cd(VCA)/dt = -FCA – kCA2V

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dd(VCA)/dt = FCAF – kCA2V

✓



For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the____________________?


aCatalyst size is reduced or the catalyst diffusivity is reduced

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bCatalyst size is reduced or the catalyst diffusivity is increased

✓


cCatalyst size is increased or the catalyst diffusivity is reduced

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dCatalyst size is increased or the catalyst diffusivity is increased

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Batch process is preferred over continuous process, when the___________________?


aProduct yields and quality cannot be achieved in continuous process, because of long residence time

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bSales demand of product is not steady

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cSame equipment cannot be used for several processes of the same nature

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dAll A., B. & C.

✓


View Answer All A., B. & C.

Rate of a chemical reaction is not affected by the____________________?


aCatalyst

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bTemperature

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cReactant’s concentration

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dNumber of molecules of reactants taking part in the reaction

✓



On application of pressure to the equilibrium system, ice ⇌ water; which of the following phenomenon will occur ?


aWater will evaporate

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bEquilibrium will not be attained

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cMore ice will be formed

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dMore water will be formed

✓



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