Explore topic-wise MCQs in Chemical Engineering.

This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

The activity of a catalyst at a time t = 0 is ____

A. Negative
B. Zero
C. Unity
D. ∞
Answer» D. ∞
Discussion
2.

If the rate of deactivation is given by –\(\frac{da}{dt}\) = 0.0064 day-1, the expression relating activity and time is ___

A. a = 0.0064t
B. a = 1-0.0064t
C. a = t
D. a = 0.0064-t
Answer» C. a = t
Discussion
3.

The slope of the curve of ln\((ln\frac{C_A}{C_{A∞}})\) and t for batch solid – fluid independent deactivation system is ___

A. ln(lnkd)
B. ln(kd)
C. kd
D. ln(kd)c) kdd) -kd
Answer» E.
Discussion
4.

The rate expression for independent deactivation for batch solids is ____

A. ln\((ln\frac{C_A}{C_{A∞}})\) = ln \(\frac{Wk’}{Vk_d}\) – kdt
B. ln \(\frac{C_A}{C_{A∞}}\) = ln \(\frac{Wk’}{Vk_d}\) – kdt
C. lnln \(\frac{C_A}{C_{A∞}}\) = ln \(\frac{Wk’}{Vk_d}\)
D. lnln \(\frac{C_A}{C_{A∞}}\) = \(\frac{Wk’}{Vk_d}\) – kdt
Answer» B. ln \(\frac{C_A}{C_{A∞}}\) = ln \(\frac{Wk’}{Vk_d}\) – kdt
Discussion
5.

Which of the following reactor arrangements causes fast deactivation?

A. Mixed flow for fluid
B. Plug flow for fluid
C. Fluidised bed reactor
D. Batch for fluid and solid
Answer» D. Batch for fluid and solid
Discussion
6.

If kd is the rate constant of deactivation and d is the order of deactivation, then the rate equations representing independent deactivation are ___

A. -r’A = k’CAna–\(\frac{da}{dt}\) = kdad
B. -r’A = k’a–\(\frac{da}{dt}\) = kdad
C. -r’A = k’CAna–\(\frac{da}{dt}\) = kd
D. -r’A = k’CAn–\(\frac{da}{dt}\) = kdad
Answer» B. -r’A = k’a–\(\frac{da}{dt}\) = kdad
Discussion
7.

The activity of a catalyst pellet is defined as the ratio of ___

A. Rate of adsorption of reactants to the catalyst surface to the rate at which the catalytic pellet converts the reactant
B. Rate at which the catalytic pellet converts the reactant to the rate of adsorption of reactants to the catalyst surface
C. Rate at which the catalytic pellet converts the reactant to the rate of reaction with a fresh pellet
D. The rate of reaction with a fresh pellet to the rate at which the catalytic pellet converts the reactant
Answer» D. The rate of reaction with a fresh pellet to the rate at which the catalytic pellet converts the reactant
Discussion
8.

Which of the following represents series type deactivation model? (Where R is the product and P is the poison)

A. A → R → P↓
B. A → P↓
C. A → R + P↓
D. A → R, A → P
Answer» B. A → P↓
Discussion
9.

The catalyst deactivation caused by deposition on surface and pores of catalyst is called ____

A. Adsorption
B. Regeneration
C. Fouling
D. Desorption
Answer» D. Desorption
Discussion
10.

State true or false.In parallel deactivation, the reactant produces a side product which deposits on the catalytic surface and deactivates it.

A. True
B. False
Answer» B. False
Discussion