Chemical Reaction Engineering – Multiple Choice Questions (MCQs)

1. 61. What is a 'batch reactor' best suited for?

   • A. Small-scale production
   • B. testing of new processes
   • C. High-volume continuous production
   • D. Reactions requiring very long residence times

2. 62. What is a 'CSTR' best suited for?

   • A. Reactions requiring uniform temperature control
   • B. Reactions with high conversion in a single pass
   • C. Reactions with severe heat effects
   • D. Very fast reactions

3. 63. What is a 'PFR' best suited for?

   • A. Reactions requiring high conversion in a single pass
   • B. Reactions requiring uniform temperature control
   • C. Reactions with very slow rates
   • D. Reactions with large heat release

4. 64. What is the major limitation of a batch reactor?

   • A. Long cycle times
   • B. Poor temperature control
   • C. Difficulty in handling solids
   • D. High operating costs

5. 65. What is the major limitation of a CSTR?

   • A. Low conversion per unit volume for given reaction kinetics
   • B. Difficulty in temperature control
   • C. High pressure drop
   • D. Channeling

6. 66. What is the major limitation of a PFR?

   • A. Difficulty in temperature control for highly exothermic/endothermic reactions
   • B. Low conversion
   • C. Poor mixing
   • D. High capital cost

7. 67. What is the role of a 'heat exchanger' in a reactor system?

   • A. To control the reaction temperature
   • B. To separate reactants and products
   • C. To mix reactants
   • D. To remove impurities

8. 68. What is 'autothermal reactor operation'?

   • A. A reactor system that uses the heat generated by an exothermic reaction to preheat the incoming reactants
   • B. making it self-sustaining
   • C. Operation without external heating or cooling
   • D. Operation at constant temperature

9. 69. What is 'catalyst effectiveness factor' for an infinitely fast reaction?

   • A. 0
   • B. 1
   • C. Depends on the Thiele modulus
   • D. Can be greater than 1

10. 70. What is 'differential reactor'?

    • A. A reactor where conversion is very low
    • B. used to obtain kinetic data
    • C. A reactor with high conversion
    • D. A reactor used for large-scale production

11. 71. What is 'integral reactor'?

    • A. A reactor where conversion is high
    • B. used to simulate industrial conditions
    • C. A reactor with very low conversion
    • D. A reactor used only for kinetic studies

12. 72. What is 'gas-solid catalytic reactor'?

    • A. A reactor where a gas phase reacts on the surface of a solid catalyst
    • B. A reactor for liquid-phase reactions
    • C. A reactor for homogeneous reactions
    • D. A reactor with no catalyst