MCQOPTIONS
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MCQOPTIONS
This section includes 22 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 atmospheric pressure is 1.0 atm and Henry’s law constant for O2 is 1.66 x 10−6 M/mm Hg at 25 °C. Assume air contains 21% oxygen. Calculate the partial pressure of oxygen. (21% of air is oxygen and the mole fraction of O2 is 0.21). |
| A. | 180 mm Hg |
| B. | 130 mm Hg |
| C. | 120 mm Hg |
| D. | 160 mm Hg |
| Answer» E. | |
| 2. |
Does yeast need oxygen in fermentation process? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
The value of Henry’s law constant increases with increasing temperature? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
The Henry’s law constant for O2 in water at 25°C is 1.27×10−3M/atm and the mole fraction of O2 in the atmosphere is 0.21. Calculate the solubility of O2 in water at 25°C at an atmospheric pressure of 1.00 atm.Strategy: ▪ Use Dalton’s law of partial pressures to calculate the partial pressure of oxygen.▪ Use Henry’s law to calculate the solubility, expressed as the concentration of dissolved gas. |
| A. | 2.5×10-4 M |
| B. | 2.1×10-4 M |
| C. | 2.3×10-4 M |
| D. | 2.7×10-4M |
| Answer» E. | |
| 5. |
Henry Law’s Constants at a system temperature of 25°C (77°F) of nitrogen is 1600 atm/(mol/litre). Molar weight of N2 is 28.0134 g/mol and partial fraction in air is ~ 0.79. Calculate the Nitrogen dissolved in the Water at atmospheric pressure. |
| A. | 0.0138 g/liter |
| B. | 0.0130 g/liter |
| C. | 0.0132 g/liter |
| D. | 0.0134 g/liter |
| E. | . Molar weight of N2 is 28.0134 g/mol and partial fraction in air is ~ 0.79. Calculate the Nitrogen dissolved in the Water at atmospheric pressure.a) 0.0138 g/literb) 0.0130 g/literc) 0.0132 g/literd) 0.0134 g/liter |
| Answer» B. 0.0130 g/liter | |
| 6. |
Henry Law’s Constants at a system temperature of 25°C (77°F) of oxygen is 756.7 atm/(mol/litre). Molar Weight of O2 is 31.9988 g/mol and partial fraction in air is ~ 0.21. Calculate the Oxygen dissolved in the Water at atmospheric pressure. |
| A. | 0.0090 g/liter |
| B. | 0.0089 g/liter |
| C. | 0.0080 g/liter |
| D. | 0.0099 g/liter |
| E. | . Molar Weight of O2 is 31.9988 g/mol and partial fraction in air is ~ 0.21. Calculate the Oxygen dissolved in the Water at atmospheric pressure.a) 0.0090 g/literb) 0.0089 g/literc) 0.0080 g/literd) 0.0099 g/liter |
| Answer» C. 0.0080 g/liter | |
| 7. |
“The amount of air dissolved in a fluid is proportional to the pressure in the system”, which law is applicable to this statement? |
| A. | Raoult’s law |
| B. | Fick’s law |
| C. | Henry’s law |
| D. | Newton’s law |
| Answer» D. Newton’s law | |
| 8. |
What is the unit of oxygen solubility “C*AL”? |
| A. | mgl-1 |
| B. | mg-1l-1 |
| C. | m-1g-1l-1 |
| D. | mgl |
| Answer» B. mg-1l-1 | |
| 9. |
Does yeast need oxygen in fermentation process?$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
The value of Henry’s law constant increases with increasing temperature?$# |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
Refer to Q14 and, Calculate the solubility of oxygen in units of grams of oxygen per liter of water. |
| A. | 0.0080 g/L |
| B. | 0.0082 g/L |
| C. | 0.0083 g/L |
| D. | 0.0085 g/L |
| Answer» E. | |
| 12. |
The atmospheric pressure is 1.0 atm and Henry’s law constant for O2 is 1.66 x 10-6 M/mm Hg at 25 °C. Assume air contains 21% oxygen. Calculate the partial pressure of oxygen. (21% of air is oxygen and the mole fraction of O2 is 0.21).$ |
| A. | 180 mm Hg |
| B. | 130 mm Hg |
| C. | 120 mm Hg |
| D. | 160 mm Hg |
| Answer» E. | |
| 13. |
Which type of homebrewer is best for 8 ppm of dissolved oxygen in solution? |
| A. | Siphon sprays |
| B. | Whipping |
| C. | Splashing and shaking |
| D. | Pure air through a stone with an aquarium pump |
| Answer» D. Pure air through a stone with an aquarium pump | |
| 14. |
The dissolved oxygen decreases when? |
| A. | The temperature is increased |
| B. | The pressure is increased |
| C. | The salinity is decreased |
| D. | The salinity is increased |
| Answer» E. | |
| 15. |
Refer to Q6 and Q7, and calculate the air dissolved in water? |
| A. | 0.0228 g/liter |
| B. | 0.0223 g/liter |
| C. | 0.0227 g/liter |
| D. | 0.0222 g/liter |
| Answer» D. 0.0222 g/liter | |
| 16. |
Henry Law’s Constants at a system temperature of 25oC (77oF) of nitrogen is 1600 atm/(mol/litre).Molar weight of N2 is 28.0134 g/mol and partial fraction in air is ~ 0.79. Calculate the Nitrogen dissolved in the Water at atmospheric pressure.$ |
| A. | 0.0138 g/liter |
| B. | 0.0130 g/liter |
| C. | 0.0132 g/liter |
| D. | 0.0134 g/liter |
| Answer» B. 0.0130 g/liter | |
| 17. |
Henry Law’s Constants at a system temperature of 25oC (77oF) of oxygen is 756.7 atm/ (mol/litre). Molar Weight of O2 is 31.9988 g/mol and partial fraction in air is ~ 0.21. Calculate the Oxygen dissolved in the Water at atmospheric pressure.$ |
| A. | 0.0090 g/liter |
| B. | 0.0089 g/liter |
| C. | 0.0080 g/liter |
| D. | 0.0099 g/liter |
| Answer» C. 0.0080 g/liter | |
| 18. |
“The amount of air dissolved in a fluid is proportional to the pressure in the system”, which law is applicable to this statement?$ |
| A. | Raoult’s law |
| B. | Fick’s law |
| C. | Henry’s law |
| D. | Newton’s law |
| Answer» D. Newton‚Äö√Ñ√∂‚àö√ë‚àö¬•s law | |
| 19. |
The solubility of oxygen in water is temperature and pressure dependent? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 20. |
The addition of ions and sugars added to the fermentation increases the oxygen solubility? |
| A. | True |
| B. | False |
| Answer» C. | |
| 21. |
What is the unit of oxygen solubility “C*AL”?$ |
| A. | mgl<sup>-1</sup> |
| B. | mg<sup>-1</sup>l<sup>-1</sup> |
| C. | m<sup>-1</sup>g<sup>-1</sup>l<sup>-1</sup> |
| D. | mgl |
| Answer» B. mg<sup>-1</sup>l<sup>-1</sup> | |
| 22. |
The partial pressure of oxygen at 1atm is ________________ |
| A. | 0.2000 atm |
| B. | 0.2098 atm |
| C. | 0.2099 atm |
| D. | 0.2096 atm |
| Answer» D. 0.2096 atm | |