Chemical Engineering MCQs

Page No. 575

Three plug flow reactors (PFR’s) of 4, 5 & 6 m3 volumes are arranged in two branches as shown below in the figure. If the total feed rate is 300 tons/hr, then for the same conversion in each branch, the feed rate through branch II should be ______________ tons/hr ?


a100


b150


c200


d225


View Answer 100

An irreversible first order reaction is being carried out in a CSTR and PFR of same volume. The liquid flow rates are same. The relative conversion will__________________?


aBe more in CSTR than in PFR


bBe more in PFR than in CSTR


cBe same in both cases


dDepend on the temperature



For an ideal mixed flow reactor (CSTR), the exit age distribution E(t) is given by __________________?


aA Dirac delta function


bA step function


cA ramp function


dNone of the above


View Answer None of the above

In case of a P.F.R., there__________________________?


aMay be lateral mixing of fluid


bShould not be any mixing along the flow path


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

The rate of the reaction, X → Y, quadruples when the concentration of ‘X’ is doubled. The rate expression for the reaction is, r = K Cx n, the value of ‘n’ in this case will be_______________________?


a0


b1


c2


d3


View Answer 2

The rate of a homogeneous reaction is a function of__________________?


aTemperature and pressure only


bTemperature and composition only


cPressure and composition only


dAll temperature, pressure and composition



For series reaction, the relative yield__________________?


aIs always greater for plug-flow reactor than for the single CSTR of the same volume


bStatement in A. is wrong


cDecreases with increasing conversion


dBoth A. and C. hold good



In autocatalytic reactions ?


aOne of the reactants acts as a catalyst


bOne of the products acts as a catalyst


cCatalysts have very high selectivity


dNo catalyst is used



The dispersion number of perfect mixed flow is__________________?


a0


b> 150


c


d< 2100


View Answer

Which of the following does not produce a change in the value of rate constant of a reaction ?


aPressure


bTemperature


cConcentration and catalyst


dNone of these



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