Chemical Reaction Engineering MCQs

Question 1

Shift conversion reaction

Accepted Answer

Converts CO to CO 2 with steam

Answer

Converts N 2 and H 2 into NH 3

Answer

Is non-catalytic

Answer

Is highly exothermic

Question 2

An isothermal aqueous phase reversible reaction, P ⇋ R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m 3 .h is given by, r = 0.5C P - 0.125C R . A stream containing only P enters the

Accepted Answer

1.6

Answer

0.8

Answer

1.33

Answer

2.67

Question 3

The rate of the chemical reaction A → B doubles as the concentration of A i.e., C A is doubled. If rate of reaction is proportional to C A n , then what is the value of n for this reaction?

Accepted Answer

1

Answer

0.5

Answer

0

Answer

2

Question 4

If helium is introduced in a reactor containing O 2 , SO 2 and SO 3 at equilibrium, so that total pressure increases while volume and temperature remains constant. In this case the dissociation of SO 3 (as per Le Chatlier principle)

Accepted Answer

Decreases

Answer

Increases

Answer

Remains unaltered

Answer

Changes unpredictably

Question 5

From Arhenius law, a plot of log e K versus $$\frac{1}{{	ext{T}}}$$ gives a straight line with a slope of $$\left( { - \frac{{	ext{E}}}{{	ext{R}}}} ight)$$ . The unit of $$\frac{{	ext{E}}}{{	ext{R}}}$$ is

Accepted Answer

°K

Answer

K cal

Answer

K cal/°K

Answer

K cal. °K

Question 6

In the gaseous phase ammonia formation reaction (N 2 + 3H 2 ⇋ 2NH 3 ), the value of the equilibrium constant depends on the

Accepted Answer

Temperature

Answer

Total pressure of the system

Answer

Volume of the reactor

Answer

Initial concentration of N 2 and H 2

Question 7

Which of the following is not a dimension-less group used in catalysis? (where, D = dispersion co-efficient, cm 2 /sec. D 1 = diffusion co-efficient, cm²/sec. L = length of the reactor, cm. t = time, sec, v = volumetric flow rate, cm 3 /sec. V = volume, cm 3 .)

Accepted Answer

None of these

Answer

Reactor dispersion number $$\left( {\frac{{	ext{D}}}{{{	ext{vL}}}}} ight)$$

Answer

Reduced time $$\left( {\frac{{{	ext{vt}}}}{{	ext{V}}}} ight)$$

Answer

Thiele modulus $$\left( {{	ext{L}}\sqrt {\frac{{	ext{k}}}{{{{	ext{D}}_1}}}} } ight)$$

Question 8

Given, 3H 2 + CO = CH 4 + H 2 O, K P = 10 1.84 and 4H 2 + CO 2 = CH 4 + 2H 2 O, K P = 10 1.17 the K P for the reaction CO + H 2 O = CO 2 + H 2 is

Accepted Answer

10 0.67

Answer

10 3.01

Answer

10 -0.67

Answer

10 -3.01

Question 9

Sulphuric acid is used as a catalyst in the

Accepted Answer

Alkylation of hydrocarbons

Answer

Hydrogenation of oils

Answer

Gas phase oxidation of SO 2 in chamber process

Answer

None of these