MCQOPTIONS
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MCQOPTIONS
This section includes 8 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. |
| A. | n Use Henry s law to calculate the solubility, expressed as the concentration of dissolved gas. |
| B. | 2.5 10<sup>-4</sup> M |
| C. | 2.1 10<sup>-4</sup> M |
| D. | 2.3 10<sup>-4</sup> M |
| E. | 2.7 10<sup>-4</sup>M |
| Answer» E. 2.7 10<sup>-4</sup>M | |
| 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 |
| 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 |
| 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<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> | |