Chemical Engineering MCQs

Page No. 557

In case of a/an ______________ chemical reaction, conversion increases with the rise in temperature?


aReversible exothermic


bIrreversible exothermic


cIrreversible endothermic


dReversible endothermic



The synthesis of proteins and metabolism in biological objects occur in the presence of biocatalyst called_________________?


aA ferment or an enzyme


bHaemoglobin


cFungi


dNone of these


View Answer Fungi

From collision theory, the reaction rate constant is proportional to_________________?


aexp (-E/RT)


bexp (-E/2RT)


c√T


dTm exp (-E/RT)


View Answer Tm exp (-E/RT)

The unit of frequency factor in Arrhenius equation is_______________?


aSame as that of rate constant


bSame as that of activation energy


cDimensionless


dNone of these



The ratio of moles of a reactant converted into the desired product to that converted into unwanted product is called_________________?


aOperational yield


bRelative yield


cSelectivity


dNone of these


View Answer Selectivity

Space time equals the mean residence time__________________?


aWhen the density of the reaction mixture is constant


bFor large diameter tubular reactor


cFor narrow diameter tubular reactor


dFor CSTR



Chemical reaction rate of a component depends upon the______________________?


aComposition of the component only


bTemperature of the system


cPressure of the system


dAll A., B. and C.


View Answer All A., B. and C.

If helium is introduced in a reactor containing O2, SO2 and SO3 at equilibrium, so that total pressure increases while volume and temperature remains constant. In this case the dissociation of SO3 (as per Le Chatelier’s principle)?


aDecreases


bIncreases


cRemains unaltered


dChanges unpredictably


View Answer Decreases

For a first order reaction carried out in a plug flow reactor, the space time is__________________?


a(1/k) ln C0/C


b(1/k) ln C/C0


ck ln C0/C


dk ln C/C0


View Answer (1/k) ln C0/C

With increase in K2/K1 in case of a unimolecular type elementary reactions as shown in the bellow figure, the fractional yield of ‘R’ in mixed reactor (for a given conversion of ‘A’) ?


aDecreases


bIncreases


cIncreases linearly


dRemain same


View Answer Decreases

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