Chemical Engineering MCQs

Page No. 560

In a consecutive reaction system of the given figure bellow, when E1 is much greater than E2, the yield of B increases with the____________________?


aIncrease of temperature

✓


bDecrease of temperature

✖


cIncrease in initial concentration of A

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dDecrease in initial concentration of A

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Helium-mercury method can be used to determine the _____________ of the catalyst particle?


aPore volume

✖


bSolid density

✖


cPorosity

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dAll A., B., & C.

✓


View Answer All A., B., & C.

Which of the following is the most suitable for very high pressure gas phase reaction ?


aBatch reactor

✖


bTubular flow reactor

✓


cStirred tank reactor

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dFluidised bed reactor

✖


View Answer Tubular flow reactor

Half life period of a chemical reaction is_________________?


aThe time required to reduce the concentration of the reacting substance to half its initial value

✓


bHalf of the space time of a reaction

✖


cHalf of the residence time of a reaction

✖


dNone of these

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Rate of a gaseous phase reaction is given by the reaction shown in the bellow figure. The unit of rate constant is__________________?


a(atm)-1

✖


b(hr)-1

✖


c(atm)-1.(hr)-1

✓


datm.(hr)-1

✖


View Answer (atm)-1.(hr)-1

In a continuous flow stirred tank reactor, the composition of the exit stream_________________?


aIs same as that in the reactor

✓


bIs different than that in the reactor

✖


cDepends upon the flow rate of inlet stream

✖


dNone of these

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Kinetics of a catalytic reaction can be best studied on a/an ______________ reactor?


aMixed

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bIntegral (plug flow)

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cDifferential (flow)

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dEither A., B. and C.

✓


View Answer Either A., B. and C.

Equilibrium of a chemical reaction as viewed by kinetics is a ______________ state?


aDynamic steady

✓


bStatic steady

✖


cDynamic unsteady

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dNone of these

✖


View Answer Dynamic steady

A pollutant P degrades according to first order kinetics. An aqueous stream containing P at 2 kmole/m3 and volumetric flow rate 1m3 /h requires a mixed flow reactor of volume V to bring down the pollutant level to 0.5 kmole/m3. The inlet concentration of the pollutant is now doubled and the volumetric flow rate is tripled. If the pollutant level is to be brought down to the same level of 0.5 k.mole/m3, the volume of the mixed flow reactor should be increased by a factor of_______________?


a7

✓


b6

✖


c3

✖


d7/3

✖


View Answer 7

In Langmuir treatment of adsorption,_________________?


aWhole surface of the catalyst does not have the same activity for adsorption and there is attraction between the adsorbed molecule

✖


bWhole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site

✓


cAll the adsorption does not take place by the same mechanism

✖


dExtent of adsorption is more than one complete monomolecular layer on the surface

✖



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