Chemical Engineering MCQs

Page No. 577

In the hydrodealkylation of toluene to benzene, the following reactions occur: C7H8 + H2 → C6H6 + CH4 2C6H6 ⇌ C12H10 + H2 Toluene and hydrogen are fed to a reactor in a molar ratio 1:5.80% of the toluene gets converted and the selectivity of benzene(defined as moles of benzene formed/moles of toluene converted) is 90%. The fractional conversion of hydrogen is_______________________?


a0.16

✖


b0.144

✓


c0.152

✖


d0.136

✖


View Answer 0.144

Vegetable oils are hydrogenated in a _______________ reactor?


aSlurry

✓


bPlug flow

✖


cHomogeneous catalytic

✖


dNone of these

✖


View Answer Slurry

B.E.T. method of finding out surface area of a catalyst, uses the extension of _________________ isotherm?


aLangmuir

✓


bFreundlich

✖


cTempkin

✖


dNone of these

✖


View Answer Langmuir

Half life period of a chemical reaction is proportional to CA0 -1, if the reaction is of _______________ order?


aFirst

✖


bZero

✖


cSecond

✓


dThird

✖


View Answer Second

‘n’ number of plug flow reactors (P.F.R) in series with a total volume ‘V’ gives the same conversion as one P.F.R. of volume________________?


aV/n

✖


bV

✓


cV.n

✖


d1/V

✖


View Answer V

The concentration of A in a first order reaction, A → B, decreases_____________________?


aLinearly with time

✖


bExponentially with time

✓


cVery abruptly towards the end of the reaction

✖


dLogarithmically with time

✖



Time required for 50% decomposition of a liquid in an isothermal batch reactor following first order kinetics is 2 minutes. The time required for 75% decomposition will be about _______________ minutes?


a3

✖


b4

✓


c6

✖


d10

✖


View Answer 4

A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by__________________?


aDiffusion within the pellet

✓


bReaction

✖


cExternal mass transfer

✖


dNone of the above

✖



The use of space time is preferred over the mean residence time in the design of a/an____________________?


aBatch reactor

✖


bIdeal tubular-flow reactor

✓


cSlurry reactor

✖


dCSTR

✖



For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of ?


aIdeal plug flow

✖


bBypass

✖


cDead zone

✓


dChannelling

✖


View Answer Dead zone

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