Chemical Reaction Engineering MCQs

Question 1

Rate determining step in a reaction consisting of a number of steps in series is the __________ step.

Accepted Answer

Slowest

Answer

Fastest

Answer

Intermediate

Answer

Data insufficient; can't be predicted

Question 2

For the gaseous reaction 2A → B, where the feed consists of 50 mole % A and 50 mole % inerts, the expansion factor is

Accepted Answer

-0.25

Answer

1

Answer

-0.5

Answer

0

Question 3

The exit age distribution curve E(t) for an ideal CSTR with the average residence time, $$	au $$, is given by

Accepted Answer

$$\frac{{{{	ext{e}}^{ - \frac{{	ext{t}}}{	au }}}}}{{	ext{T}}}$$

Answer

$${{	ext{e}}^{ - \frac{{	ext{t}}}{	au }}}$$

Answer

$$1 - {{	ext{e}}^{ - \frac{{	ext{t}}}{	au }}}$$

Answer

$$1 - \frac{{{{	ext{e}}^{ - \frac{{	ext{t}}}{	au }}}}}{{	ext{T}}}$$

Question 4

With increase in temperature, the equilibrium conversion of a reversible exothermic reaction

Accepted Answer

Decreases

Answer

Increases

Answer

Remains unaffected

Answer

Decreases linearily with temperature

Question 5

Arhenious equation shows the variation of __________ with temperature.

Accepted Answer

Rate constant

Answer

Reaction rate

Answer

Energy of activation

Answer

Frequency factor

Question 6

Chemical reaction rate of a component depends upon the

Accepted Answer

All of the above

Answer

Composition of the component only

Answer

Temperature of the system

Answer

Pressure of the system

Question 7

Which of the following is a characteristic of an ideal plug flow reactor?

Accepted Answer

Flat velocity profile

Answer

Axial dispersion

Answer

Uniform mixing

Answer

None of these

Question 8

What is the order of a chemical reaction in which doubling the initial concentration of the reactants doubles the half life time of the reaction?

Accepted Answer

0

Answer

1

Answer

2

Answer

3

Question 9

A pulse tracer is introduced in an ideal CSTR (with a mean residence time ι) at time, t = 0. The time taken for the exit concentration of the tracer to reach half of its initial value will be

Accepted Answer

2τ

Answer

0.5τ

Answer

τ/0.693

Answer

0.693τ