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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