MCQOPTIONS
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MCQOPTIONS
This section includes 9 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. |
To increase the overall rate of a rxn limited by internal diffusion the reaction should not ______ |
| A. | decrease the radius R |
| B. | increase the concentration of A |
| C. | increase the radius R |
| D. | increase the temperature |
| Answer» D. increase the temperature | |
| 2. |
Concentration at the surface of the spherical catalyst will be higher than the inside of the catalyst. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
The natural convection air cooled condensers are used in ________ |
| A. | Water coolers |
| B. | Domestic refrigerator |
| C. | Room air conditioners |
| D. | Water boilers |
| Answer» C. Room air conditioners | |
| 4. |
What is the concept of overall coefficient of heat transfer is used in heat transfer problems? |
| A. | Conduction |
| B. | Convection |
| C. | Radiation |
| D. | Conduction and convection |
| Answer» E. | |
| 5. |
Non-viable yeast cells are immobilised in alginate beads. The beads are stirred in glucose medium under anaerobic conditions. The effective diffusivity of glucose in the beads depends on cell density according to the relationship:
|
| A. | nwhere ( mathcal{D}_{Ac} ) is effective diffusivity 10<sup>10</sup> m<sup>2</sup> s<sup>-1</sup> and y<sub>C</sub> is the weight fraction of yeast in the gel. Rate of glucose uptake can be assumed to be zero order; the rate constant at a yeast density in alginate of 15 wt% is 0.5 g l<sup>-1</sup> min<sup>-1</sup>. For maximum reaction rate, the concentration of glucose inside the particles should remain above zero. Estimate the value of k<sub>0</sub>, Converting k<sub>0</sub> to units of kg, m and s? |
| B. | 8.33 x 10<sup>-3</sup> kg m<sup>-3</sup> s<sup>-1</sup> |
| C. | 6.33 x 10<sup>-3</sup> kg m<sup>-3</sup> s<sup>-1</sup> |
| D. | 4.33 x 10<sup>-3</sup> kg m<sup>-3</sup> s<sup>-1</sup> |
| E. | 2.33 x 10<sup>-3</sup> kg m<sup>-3</sup> s<sup>-1</sup> |
| Answer» B. 8.33 x 10<sup>-3</sup> kg m<sup>-3</sup> s<sup>-1</sup> | |
| 6. |
The unit of intrinsic factor k remains constant in every order. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
Refer to Q4 and Q5, and Estimate the intrinsic first-order rate constant k1 . |
| A. | 0.005 s<sup>-1</sup> |
| B. | 0.015 s<sup>-1</sup> |
| C. | 0.025 s<sup>-1</sup> |
| D. | 0.035 s<sup>-1</sup> |
| Answer» C. 0.025 s<sup>-1</sup> | |
| 8. |
Enzyme is immobilised in 8 mm diameter agarose beads at a concentration of 0.018 kg protein m-3 gel. Ten beads are immersed in a well-mixed solution containing 3.2 10-3 kg m-3 substrate. The effective diffusivity of substrate in agarose gel is 2.1 10-9 m2 s-1. Kinetics of the enzyme can be approximated as first order with specific rate constant 3.11 105 s 1 per kg protein. Mass transfer effects outside the particles are negligible. Estimate the volume per bead. |
| A. | 2.65 10<sup>-7</sup> m<sup>3</sup> |
| B. | 2.66 10<sup>-7</sup> m<sup>3</sup> |
| C. | 2.67 10<sup>-7</sup> m<sup>3</sup> |
| D. | 2.68 10<sup>-7</sup> m<sup>3</sup> |
| Answer» E. | |
| 9. |
The effective diffusivity of substrate in the solid, ( mathcal{D}_{Ac} ) is dependent of substrate. |
| A. | True |
| B. | False |
| Answer» C. | |