MCQOPTIONS
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MCQOPTIONS
This section includes 14 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. |
The diffusion of gas is ____________ |
| A. | Linear process |
| B. | Slow process |
| C. | Spontaneous process |
| D. | Non- spontaneous process |
| Answer» D. Non- spontaneous process | |
| 2. |
What is the unit of diffusion flux “J” in the Fick’s law equation? |
| A. | mol m−2 s−1 |
| B. | mol m2 s−1 |
| C. | mol m2 s1 |
| D. | mol m−2 s1 |
| Answer» B. mol m2 s−1 | |
| 3. |
In a gas mixture of hydrogen and oxygen, steady state equimolar counter diffusion is occurring at a total pressure of 100 kPa and temperature of 20°C. If the partial pressures of oxygen at two planes 0.01 m apart, and perpendicular to the direction of diffusion are 15 kPa and 5 kPa, respectively and the mass diffusion flux of oxygen in the mixture is 1.6 * 10–5 kmol/m2.sec, calculate the molecular diffusivity for the system.For equimolar counter current diffusion: |
| A. | 2.898×10-5 m2/sec |
| B. | 3.898×10-5 m2/sec |
| C. | 2.989×10-5 m2/sec |
| D. | 3.989×10-5 m2/sec |
| Answer» C. 2.989×10-5 m2/sec | |
| 4. |
Refer to Q6, and calculate the partial pressure at a point 0.02 m apart from point 1. |
| A. | 20.63 kPa |
| B. | 28.33 kPa |
| C. | 28.63 kPa |
| D. | 20.33 kPa |
| Answer» C. 28.63 kPa | |
| 5. |
Methane diffuses at steady state through a tube containing helium. At point 1 the partial pressure of methane is pA1 = 55 kPa and at point 2, 0.03 m apart PA2 = 15 KPa. The total pressure is 101.32 kPa, and the temperature is 298 K. At this pressure and temperature, the value of diffusivity is 6.75 * 10–5 m2/sec.Calculate the flux of CH4 at steady state for equimolar counter diffusion.For steady state equimolar counter diffusion, molar flux is given by: |
| A. | 3.666×10-5 kmol/m2 sec |
| B. | 3.866×10-5 kmol/m2 sec |
| C. | 3.833×10-5 kmol/m2 sec |
| D. | 3.633×10-5 kmol/m2 sec |
| Answer» E. | |
| 6. |
Refer to Q4, and calculate the diffusivity of O2 in a gas mixture. |
| A. | 1.539×10-5 m2/sec |
| B. | 1.639×10-5 m2/sec |
| C. | 1.530×10-5 m2/sec |
| D. | 1.630×10-5 m2/sec |
| Answer» B. 1.639×10-5 m2/sec | |
| 7. |
Determine the diffusivity of CO2 in a gas mixture having the composition:CO2: 28.5 %, O2: 15%, N2: 56.5%,The gas mixture is at 273 k and 1.2 * 105 Pa. The binary diffusivity values are given as: (at 273 K)D12 P = 1.874 m2 Pa/secD13 P = 1.945 m2 Pa/secD23 P = 1.834 m2 Pa/sec |
| A. | 1.51×10-5 m2/sec |
| B. | 1.50×10-5 m2/sec |
| C. | 1.61×10-5 m2/sec |
| D. | 1.60×10-5 m2/sec |
| Answer» D. 1.60×10-5 m2/sec | |
| 8. |
What is Fick’s law applicable to? |
| A. | Momentum transfer |
| B. | Heat transfer |
| C. | Mass transfer |
| D. | Velocity transfer |
| Answer» D. Velocity transfer | |
| 9. |
In the following equation, what does y signifies? |
| A. | Dispersion |
| B. | Displacement |
| C. | Diffusion |
| D. | Distance |
| Answer» E. | |
| 10. |
898√ó10-5_m2/sec$# |
| A. | 3.898√ó10-5 m<sup>2</sup>/sec |
| B. | 2.989√ó10-5 m<sup>2</sup>/sec |
| C. | 3.989√ó10-5 m<sup>2</sup>/sec |
| Answer» D. | |
| 11. |
Refer to Q6, and calculate the partial pressure at a point 0.02 m apart from point 1? |
| A. | 20.63 kPa |
| B. | 28.33 kPa |
| C. | 28.63 kPa |
| D. | 20.33 kPa |
| Answer» C. 28.63 kPa | |
| 12. |
Refer to Q4, and calculate the diffusivity of O2 in a gas mixture. |
| A. | 1.539√ó10<sup>-5</sup> m<sup>2</sup>/sec |
| B. | 1.639√ó10<sup>-5</sup> m<sup>2</sup>/sec |
| C. | 1.530√ó10<sup>-5</sup> m<sup>2</sup>/sec |
| D. | 1.630√ó10<sup>-5</sup> m<sup>2</sup>/sec |
| Answer» B. 1.639‚Äö√†√∂‚àö‚â•10<sup>-5</sup> m<sup>2</sup>/sec | |
| 13. |
What is Fick’s law applicable to?$ |
| A. | Momentum transfer |
| B. | Heat transfer |
| C. | Mass transfer |
| D. | Velocity transfer |
| Answer» D. Velocity transfer | |
| 14. |
Molecular diffusion is which type of motion? |
| A. | Thermal motion |
| B. | Linear motion |
| C. | Non- turbulent motion |
| D. | Rectilinear motion |
| Answer» B. Linear motion | |