Chemical Reaction Engineering MCQs

Question 1

The units of frequency factor in Arhenious equation

Accepted Answer

Are the same as those of the rate constant

Answer

Depend on the order of the reaction

Answer

Depend on temperature, pressure etc. of the reaction

Answer

Are cycles per unit time

Question 2

Pick out the wrong statement.

Accepted Answer

Enzymes help in increasing the activation energy of the reaction

Answer

Catalytic activity of enzyme catalysed reactions which is affected by temperature, pH value & chemical agents, is maximum at a temperature of about 45°C

Answer

Most of the enzyme catalysed reactions involve at least two substrates

Answer

Equilibrium concentrations in enzyme catalysed reactions can be calculated by using the thermodynamic properties of substrates & products

Question 3

Differential method for analysing the kinetic data is used

Accepted Answer

For testing complicated mechanisms

Answer

When the data are scattered

Answer

When rate expressions are very simple

Answer

None of these

Question 4

Integral method for analysing the kinetic data is used

Accepted Answer

Both A and B

Answer

When the data are scattered

Answer

For testing specific mechanisms with simple rate expressions

Answer

None of these

Question 5

In a/an __________ reactor, there is exchange of heat with the surroundings with sizeable temperature variation.

Accepted Answer

Non-adiabatic

Answer

Adiabatic

Answer

Isothermal

Answer

None of these

Question 6

From collison theory, the reaction rate constant is proportional to

Accepted Answer

T m .exp(- E/RT)

Answer

Exp(- E/RT)

Answer

Exp(- E/2RT)

Answer

√T

Question 7

Fractional conversion __________ with increase in pressure for ammonia synthesis reaction i.e., N 2 + 3H 2 ⇋ 2NH 3 .

Accepted Answer

Increases

Answer

Decreases

Answer

Remains unchanged

Answer

Unpredictable from the data

Question 8

The sequence in which three CSTR's of volumes 5, 10 and 15 m 3 will be connected in series to obtain the maximum production in a second order irreversible reaction is

Accepted Answer

15, 10, 5

Answer

5, 10, 15

Answer

10, 5, 15

Answer

10, 15, 5

Question 9

The reaction A → B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m 3 is fed to the reactor at the rate of 0.01 m 3 /s and at a temperature of 500 K. If the exit conversion is 20%, then the exit temperature (in k) is (Data: Heat of reaction at 298 K = -50000 kJ/kmole of A reacted Heat capacities C PA = C PB = 100 kJ/kmole. K (may be assumed to be independent of temperature))

Accepted Answer

600

Answer

400

Answer

500

Answer

1000