Chemical Engineering MCQs

Page No. 574

The conversion for a first order liquid phase reaction. A → B in a CSTR is 50%. If another CSTR of the same volume is connected in series, then the % conversion at the exit of the second reactor will be_____________________?


a60


b75


c75


d100


View Answer 75

For the same residence time, which one will give the maximum conversion ?


aSingle stirred tank (v = 5 litres)


bTwo stirred tank (each of 2.5 litres) in series


cStirred tank followed by tubular flow reactor (each of 2.5 litres)


dSingle tubular flow reactor (v = 5 litres)



The effectiveness factor for large value of Thiele modulus [L√(K/D1)] of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm2/second) ?


aL √(K/D1)


b1/[L√(K/D1)]


c1


d


View Answer 1/[L√(K/D1)]

‘Unreacted core model’ represents the reaction involving ______________________?


aCombustion of coal particles


bRoasting of sulphide ores


cManufacture of carbon disulphide from elements


dNone of these



The value of Steric factor ‘P’ in the equation k = PZeE/RT usually ranges from ______________________?


a1.0 to 10-8


b1.1 to 102


c0.1 to 0.9


dNone of these


View Answer 1.0 to 10-8

Half life period of a first order irreversible reaction A → B is ______________________?


ak/2


bln k/2


cln 2/k


dln 0.5/k


View Answer ln 2/k

A stirred tank reactor compared to tubular-flow reactor provides____________________?


aMore uniform operating conditions


bPermits operation at the optimum temperature for a long reaction time


cHigher overall selectivity for a first order consecutive reaction


dAll A., B. and C.


View Answer All A., B. and C.

The rate of an autocatalytic reaction as shown in the bellow figure, is given by – rA = k . CA . CB. In this case, the__________________?


aPlot of – rA Vs CA is a straight line with slope k


bPlot of – rA Vs CA is a hyperbola


cRate of disappearance of reactant A is maximum, where CA = CB


dBoth B & C


View Answer Both B & C

Fluid flow in a real packed bed can be approximated as ________________ model?


aPlug flow


bDispersion


cMixed flow


dTank in series


View Answer Dispersion

The first order gas phase reaction as shown in the bellow figure is conducted isothermally in batch mode. The rate of change of conversion with time is given by________________?


adXA/dt = k1 (1 – XA)2 (1 + 2XA)


bdXA/dt = k1 (1 – XA) (1 + 0.5XA)


cdXA/dt = k1 (1 – XA)


ddXA/dt = k1 (1 – XA)/(1 + XA)



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