MCQOPTIONS
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MCQOPTIONS
This section includes 24 Mcqs, each offering curated multiple-choice questions to sharpen your Bioprocess Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the unit of heat transfer coefficient? |
| A. | Watt m2 / k |
| B. | Watt m2 k |
| C. | Watt / m2 k |
| D. | Watt / m2k2 |
| Answer» D. Watt / m2k2 | |
| 2. |
Molar flux consist of ______________ |
| A. | Molar flux = partial flux + diffusion |
| B. | Total flux = bulk motion + diffusion |
| C. | Molar flux = solid motion + flow rate |
| D. | Total flux = partial flux + flow rate |
| Answer» C. Molar flux = solid motion + flow rate | |
| 3. |
If a species appears in the numerator of the rate law, it is probably a product. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
Rate at the surface will be higher due to heat transfer limitations. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
If the reaction is endothermic, the temperature at the catalyst surface will be less. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
Refer to Q6 and calculate the value of CAs. |
| A. | 1.9 g m-3 |
| B. | 0.9 g m-3 |
| C. | 2.9 g m-3 |
| D. | 3.9 g m-3 |
| Answer» B. 0.9 g m-3 | |
| 7. |
Denitrifying bacteria are immobilised in gel beads and used in a stirred reactor for removal of nitrate from groundwater. At a nitrate concentration of 3 g m-3, the conversion rate is 0.011 g s-1 m-3 catalyst. The effective diffusivity of nitrate in the gel is 1.5×10-9 m2 s-1, the beads are 6 mm in diameter, and the liquid-solid mass-transfer coefficient is 10-5 m s-1. Km for the immobilised bacteria is approximately 25 g m-3. What is the value of an observable modulus for external mass transfer, Ω? |
| A. | 0.35 |
| B. | 0.36 |
| C. | 0.37 |
| D. | 0.38 |
| Answer» D. 0.38 | |
| 8. |
Removing the boundary layer, CAS would decrease. |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
If Ω |
| A. | CAS = CAb |
| B. | CAS < CAb |
| C. | CAS > CAb |
| D. | CAS = CAb = 0 |
| Answer» B. CAS < CAb | |
| 10. |
What is the dimension of liquid – phase mass-transfer coefficient “kS”? |
| A. | LT-1 |
| B. | LT |
| C. | L-1T-1 |
| D. | L-1T |
| Answer» B. LT | |
| 11. |
RATE_AT_THE_SURFACE_WILL_BE_HIGHER_DUE_TO_HEAT_TRANSFER_LIMITATIONS.?$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
Molar flux consist of ______________$ |
| A. | Molar flux = partial flux + diffusion |
| B. | Total flux = bulk motion + diffusion |
| C. | Molar flux = solid motion + flow rate |
| D. | Total flux = partial flux + flow rate |
| Answer» C. Molar flux = solid motion + flow rate | |
| 13. |
If_a_species_appears_in_the_numerator_of_the_rate_law,_it_is_probably_a_product.$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 14. |
The ratio of momentum diffusivity (kinematic viscosity) and mass diffusivity is referred as: |
| A. | Nusselt number |
| B. | Schimdt number |
| C. | Sherwood number |
| D. | Reynolds number |
| Answer» C. Sherwood number | |
| 15. |
What is the unit of mass transfer coefficient? |
| A. | ms |
| B. | m/s |
| C. | ms<sup>2</sup> |
| D. | ms<sup>-2</sup> |
| Answer» C. ms<sup>2</sup> | |
| 16. |
What_is_the_unit_of_heat_transfer_coefficient? |
| A. | Watt m<sup>2</sup>/ k |
| B. | Watt m<sup>2</sup> k |
| C. | Watt/ m<sup>2</sup> k |
| D. | Watt/ m<sup>2</sup>k<sup>2</sup> |
| Answer» D. Watt/ m<sup>2</sup>k<sup>2</sup> | |
| 17. |
If the reaction is endothermic, the temperature at the catalyst surface will be less? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 18. |
Refer to Q6 and calculate the value of CAs. |
| A. | 1.9 g m<sup>-3</sup> |
| B. | 0.9 g m<sup>-3</sup> |
| C. | 2.9 g m<sup>-3</sup> |
| D. | 3.9 g m<sup>-3</sup> |
| Answer» B. 0.9 g m<sup>-3</sup> | |
| 19. |
Denitrifying bacteria are immobilised in gel beads and used in a stirred reactor for removal of nitrate from groundwater. At a nitrate concentration of 3 g m-3, the conversion rate is 0.011 g s-1 m-3 catalyst. The effective diffusivity of nitrate in the gel is 1.5×10-9 m2 s-1, the beads are 6 mm in diameter, and the liquid-solid mass-transfer coefficient is 10-5 m s-1. Km for the immobilised bacteria is approximately 25 g m-3. What is the value of an observable modulus for external mass transfer, Ω?$ |
| A. | 0.35 |
| B. | 0.36 |
| C. | 0.37 |
| D. | 0.38 |
| Answer» D. 0.38 | |
| 20. |
Mass transfer resistance leads to an increase in the concentration of reactants at the catalyst surface in bulk fluid. |
| A. | True |
| B. | False |
| Answer» C. | |
| 21. |
Removing the boundary layer, CAS would decrease. |
| A. | True |
| B. | False |
| Answer» C. | |
| 22. |
If Ω |
| A. | C<sub>AS</sub> = C<sub>Ab</sub> |
| B. | C<sub>AS</sub> < C<sub>Ab</sub> |
| C. | C<sub>AS</sub>> C<sub>Ab</sub> |
| D. | C<sub>AS</sub> = C<sub>Ab</sub> = 0 |
| Answer» B. C<sub>AS</sub> < C<sub>Ab</sub> | |
| 23. |
What is the dimension of liquid – phase mass-transfer coefficient “kS”?$ |
| A. | LT<sup>-1</sup> |
| B. | LT |
| C. | L<sup>-1</sup>T<sup>-1</sup> |
| D. | L<sup>-1</sup>T |
| Answer» B. LT | |
| 24. |
When the boundary layer is present in the shell mass transfer then? |
| A. | C<sub>As</sub> = C<sub>Ab</sub> |
| B. | C<sub>As</sub> ≠ C<sub>Ab</sub> |
| C. | C<sub>As</sub> < C<sub>Ab</sub> |
| D. | C<sub>As</sub> > C<sub>Ab</sub> |
| Answer» E. | |