Chemical Reaction Engineering – Multiple Choice Questions (MCQs)

1. 49. What is 'catalyst regeneration'?

   • A. Restoring the activity of a deactivated catalyst
   • B. Making a new catalyst
   • C. Disposing of spent catalyst
   • D. Deactivating a catalyst

2. 50. What is 'reaction engineering'?

   • A. The application of chemical engineering principles to the design and operation of chemical reactors
   • B. The study of chemical kinetics
   • C. The study of thermodynamics
   • D. The study of mass transfer

3. 51. What is the 'pressure effect' on reaction rate?

   • A. Significant for gas-phase reactions with a change in the number of moles
   • B. Insignificant for gas-phase reactions
   • C. Only affects liquid-phase reactions
   • D. Has no effect on reaction rate

4. 52. What is the 'reaction mechanism'?

   • A. A sequence of elementary steps by which an overall reaction occurs
   • B. The overall stoichiometric equation
   • C. The rate law of the reaction
   • D. The activation energy of the reaction

5. 53. What is a 'batch distillation reactor'?

   • A. A reactor that combines reaction and separation in a single unit operation
   • B. A reactor that only performs distillation
   • C. A reactor that only performs reaction
   • D. A reactor for continuous operation

6. 54. What is 'reactor stability'?

   • A. The ability of a reactor to maintain steady-state operation in the face of small disturbances
   • B. The ability to operate at high temperatures
   • C. The ability to achieve high conversion
   • D. The ability to resist corrosion

7. 55. What is 'axial dispersion' in a PFR?

   • A. Deviation from ideal plug flow due to some back-mixing or bypassing
   • B. Perfect radial mixing
   • C. No mixing in any direction
   • D. Complete back-mixing

8. 56. What is 'radial dispersion' in a PFR?

   • A. Mixing perpendicular to the direction of flow
   • B. Mixing along the direction of flow
   • C. No mixing
   • D. Perfect plug flow

9. 57. What is the Peclet number (Pe) in reactor engineering?

   • A. A dimensionless number that compares the rate of convective transport to the rate of diffusive transport
   • B. A dimensionless number for reaction rate
   • C. A dimensionless number for heat transfer
   • D. A dimensionless number for mass transfer

10. 58. What does a low Peclet number indicate?

    • A. Closer to plug flow behavior
    • B. Closer to CSTR behavior
    • C. Negligible back-mixing
    • D. High fluid velocity

11. 59. What is 'adiabatic operation' of a reactor?

    • A. Operation without heat exchange with the surroundings
    • B. Operation at constant temperature
    • C. Operation with cooling
    • D. Operation with heating

12. 60. What is 'isothermal operation' of a reactor?

    • A. Operation at constant temperature
    • B. Operation without heat exchange
    • C. Operation with heating
    • D. Operation with cooling