Chemical Engineering MCQs

Page No. 573

The ‘E’ curve for a non-ideal reactor defines the fraction of fluid having age between t and t + dt _____________________?


aAt the inlet


bAt the outlet


cIn the reactor


dAveraged over the inlet and outlet


View Answer At the outlet

Molecularity of an elementary reaction, P + Q → R + S is ____________________?


a1


b2


c3


d4


View Answer 4

The exit age distribution of a fluid leaving a vessel (denoted by E) is used to study the extent of non-ideal flow in the vessel. The value of ∫∞ 0 E.dt is____________________?


a0


b1


c


d√2π


View Answer 1

Effectiveness factor E. of a catalyst pellet is defined as, E = (actual rate within pore of the catalyst)/(rate if not snowed by pore diffusion), Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus) ___________________?


atan hT/T


btan T/T


ctan hT/tan T


dNone of these


View Answer tan hT/T

Photo-chemical reactions occur in presence of ___________________?


aSunlight


bDarkness


cSolid catalysts


dMonochromatic radiation only


View Answer Sunlight

The conversion of a reactant, undergoing a first order reaction, at a time equal to three times the half life of the reaction is ?


a0.875


b0.5


c0.425


dData insufficient to calculate


View Answer 0.875

The heat of reaction__________________?


aDepends on the pressure only


bDepends on the mechanism of reaction only


cDepends on both pressure and mechanism of reaction


dIs independent of the mechanism of reaction



Space velocity____________________?


aDescribes the extensive operating characteristics of a tubular flow reactor


bIs the maximum feed rate per unit volume of reactor for a given conversion


cIs a measure of the ease of the reaction


dAll A., B. and C.


View Answer All A., B. and C.

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


aLess than


bEqual to


cMore than


dEqual to or more than


View Answer Equal to or more than

For a _____________ order reaction, the units of rate constant and rate of reaction are the same ?


aZero


bFirst


cSecond


dFractional


View Answer Zero

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