Chemical Engineering Mcqs

Which one is the rate controlling step in a solid-gas non-catalytic reaction occurring at very high temperature ?

(A) Pore diffusion
(B) Film diffusion
(C) Ash layer diffusion
(D) Chemical reaction

Submitted By :Ali Uppal

The energy balance equation over a tubular reactor under transient conditions is________________?

(A) An ordinary non-linear differential equation
(B) An algebraic differential equation
(C) A linear partial differential equation
(D) A non-linear partial differential equation

Submitted By :Ali Uppal

Exothermic reactions are best carried out in ________________?

(A) A CSTR
(B) CSTR in series
(C) A plug flow reactor followed by CSTR
(D) CSTR followed by a plug flow reactor

Submitted By :Ali Uppal

The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the__________________?

(A) Reaction is elementary with a molecularity of 2
(B) Molecularity of the reaction is 2, but the reaction may not be elementary
(C) Reaction may be elementary with molecularity of 2
(D) Reaction is elementary but the molecularity may not be 2

Submitted By :Ali Uppal

Backmixing is most predominant in___________________?

(A) A well stirred batch reactor
(B) A plug-flow reactor
(C) A single CSTR
(D) CSTR’s connected in series

Submitted By :Ali Uppal

For the chemical reaction X → Y, it is observed that, on doubling the concentration of ‘X’, the reaction rate quadruples. If the reaction rate is proportional to Cx n, then what is the value of „n‟ ?

(A) 1/4
(B) 2
(C) 4
(D) 16

Submitted By :Ali Uppal

An endothermic second order reaction is carried out in an adiabatic plug flow reactor. The rate of heat generation is ___________________?

(A) Maximum at the inlet of the reactor
(B) Maximum at the exit of the reactor
(C) Maximum at the centre of the reactor
(D) Constant throughout the reactor

Submitted By :Ali Uppal

The decomposition of A into B is represented by the exothermic reaction, A ⇌ 2B. To achieve maximum decomposition, it is desirable to carry out the reaction ?

(A) At high P and high T
(B) At low P and high T
(C) At low P and low T
(D) At high P and low T

Submitted By :Ali Uppal

The excess energy of the reactants required to dissociate into products is known as the ________________ energy?

(A) Thermal
(B) Activation
(C) Threshold
(D) Binding

Submitted By :Ali Uppal

The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of _______________ order?

(A) Zero
(B) First
(C) Second
(D) None of these

Submitted By :Ali Uppal

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