Chemical Engineering MCQs

Page No. 572

Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A → 3B. Mole fraction of A in the exit stream is______________________?


a1/2


b1/3


c1/4


d1/5


View Answer 1/3

A chemical reaction occurs when the energy of the reacting molecules is __________________ the activation energy of the reaction?


aLess than


bEqual to


cMore than


dEqual to or more than


View Answer Equal to or more than

For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the _______________ is the controlling resistance?


aFilm diffusion


bDiffusion through ash layer


cChemical reaction


dEither A., B. or C.



A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by________________?


akeff = k + kg


bkeff = (k+ kg)/2


ckeff = (kkg)1/2


d1/keff = 1/k + 1/kg


View Answer 1/keff = 1/k + 1/kg

Decomposition rate of a liquid ‘X’ which decomposes as per the reaction as shown in the bellow figure is given by________________?


aK1 . CX


b(K1 + K2 + K3) CX


c(K1 + K2) CX


d(K2 + K3) CX


View Answer (K1 + K2) CX

The sequence in which three CSTR’s of volumes 5, 10 and 15 m3 will be connected in series to obtain the maximum production in a second order irreversible reaction is ____________________?


a15, 10, 5


b5, 10, 15


c10, 5, 15


d10, 15, 5


View Answer 15, 10, 5

Given, 3H2 + CO = CH4 + H2O, KP = 101.84 and, 4H2 + CO2 = CH4 + 2H2O, KP = 101.17 the KP for the reaction CO + H2O = CO2 + H2 is __________________?


a103.01


b10-0.67


c10-3.01


d100.67


View Answer 100.67

Which of the following is not a dimension-less group used in catalysis? (Where, D = dispersion co-efficient, cm2/sec.D1 = diffusion co-efficient; cm2/sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm3/sec. V = volume, cm3.) ?


aReactor dispersion number (D/vL)


bReduced time (vt/V)


cThiele modulus L √(k/D1)


dNone of these


View Answer None of these

The conversion XA and residence time data are collected for zero order liquid phase reaction in a stirred tank reactor. Which of the following will be a straight line ?


aXA Vs . η


bXA Vs ln η


cXA/(1 – XA)Vs η


dXA(1 – XA)Vs η


View Answer XA Vs . η

For the reaction as shown in the bellow figure, the rate of formation of Z is 0.2 gm mole/litre.hr. What is the rate of disappearance of X in gm mole/litre.hr ?


a0.4


b0.1


c0.2


dNone of these


View Answer 0.4

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