Chemical Reaction Engineering – Multiple Choice Questions (MCQs)

1. 13. What is the 'design equation' for a CSTR?

   • A. t = N_A0 ∫(dX_A / (-r_A * V))
   • B. V = F_A0 * X_A / (-r_A)
   • C. V = (F_A0 * X_A) / (-r_A)
   • D. C_A = C_A0 * (1 - X_A)

2. 14. What is the 'design equation' for a PFR?

   • A. t = N_A0 ∫(dX_A / (-r_A * V))
   • B. V = F_A0 * X_A / (-r_A)
   • C. V = F_A0 ∫(dX_A / (-r_A))
   • D. C_A = C_A0 * (1 - X_A)

3. 15. What is 'space time' (τ)?

   • A. The time required to process one reactor volume of feed at inlet conditions
   • B. The actual residence time of fluid in a reactor
   • C. The reaction time
   • D. The time for conversion to reach 100%

4. 16. What is 'space velocity' (SV)?

   • A. The inverse of space time
   • B. The volume of feed processed per unit time per unit reactor volume
   • C. The reciprocal of space time
   • D. The volume of reactor divided by volumetric flow rate

5. 17. What is an 'elementary reaction'?

   • A. A reaction that occurs in a single step exactly as written in the stoichiometric equation
   • B. A reaction with multiple steps
   • C. A reaction with a catalyst
   • D. A reaction that produces multiple products

6. 18. What is a 'non-elementary reaction'?

   • A. A reaction that occurs in a single step
   • B. A reaction that consists of multiple elementary steps
   • C. A reaction without a catalyst
   • D. A reaction that produces only one product

7. 19. What is a 'catalyst'?

   • A. A substance that increases the rate of a chemical reaction without being consumed in the reaction
   • B. A reactant
   • C. A product
   • D. A substance that slows down a reaction

8. 20. What is 'heterogeneous catalysis'?

   • A. Catalysis where the catalyst is in a different phase from the reactants
   • B. Catalysis where the catalyst and reactants are in the same phase
   • C. Catalysis without a solid catalyst
   • D. Catalysis in a gas phase

9. 21. What is 'homogeneous catalysis'?

   • A. Catalysis where the catalyst is in a different phase
   • B. Catalysis where the catalyst and reactants are in the same phase
   • C. Catalysis with a solid catalyst
   • D. Catalysis that occurs on a surface

10. 22. What is 'autocatalysis'?

    • A. A reaction in which one of the products acts as a catalyst for the reaction
    • B. A reaction that requires an external catalyst
    • C. A reaction that produces no catalyst
    • D. A reaction that is inhibited by its products

11. 23. What is 'inhibition' in chemical reactions?

    • A. A substance that decreases the rate of a chemical reaction
    • B. A substance that increases the rate of a chemical reaction
    • C. A substance that does not affect the rate
    • D. A substance that participates in the reaction

12. 24. What is the 'yield' in a chemical reaction?

    • A. The amount of desired product formed relative to the theoretical maximum based on the limiting reactant
    • B. The amount of reactant consumed
    • C. The reaction rate
    • D. The selectivity of the reaction