Chemical Engineering Mcqs

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

(A) Plot of – rA Vs CA is a straight line with slope k
(B) Plot of – rA Vs CA is a hyperbola
(C) Rate of disappearance of reactant A is maximum, where CA = CB
(D) Both B & C

Submitted By :Ali Uppal

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

(A) Plug flow
(B) Dispersion
(C) Mixed flow
(D) Tank in series

Submitted By :Ali Uppal

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________________?

(A) dXA/dt = k1 (1 – XA)2 (1 + 2XA)
(B) dXA/dt = k1 (1 – XA) (1 + 0.5XA)
(C) dXA/dt = k1 (1 – XA)
(D) dXA/dt = k1 (1 – XA)/(1 + XA)

Submitted By :Ali Uppal

Three plug flow reactors (PFR’s) of 4, 5 & 6 m3 volumes are arranged in two branches as shown below in the figure. If the total feed rate is 300 tons/hr, then for the same conversion in each branch, the feed rate through branch II should be ______________ tons/hr ?

(A) 100
(B) 150
(C) 200
(D) 225

Submitted By :Ali Uppal

An irreversible first order reaction is being carried out in a CSTR and PFR of same volume. The liquid flow rates are same. The relative conversion will__________________?

(A) Be more in CSTR than in PFR
(B) Be more in PFR than in CSTR
(C) Be same in both cases
(D) Depend on the temperature

Submitted By :Ali Uppal

For an ideal mixed flow reactor (CSTR), the exit age distribution E(t) is given by __________________?

(A) A Dirac delta function
(B) A step function
(C) A ramp function
(D) None of the above

Submitted By :Ali Uppal

The rate of a homogeneous reaction is a function of__________________?

(A) Temperature and pressure only
(B) Temperature and composition only
(C) Pressure and composition only
(D) All temperature, pressure and composition

Submitted By :Ali Uppal

Space velocity____________________?

(A) Describes the extensive operating characteristics of a tubular flow reactor
(B) Is the maximum feed rate per unit volume of reactor for a given conversion
(C) Is a measure of the ease of the reaction
(D) All

Submitted By :Ali Uppal

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

(A) Less than
(B) Equal to
(C) More than
(D) Equal to or more than

Submitted By :Ali Uppal

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

(A) Zero
(B) First
(C) Second
(D) Fractional

Submitted By :Ali Uppal

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