MCQOPTIONS
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MCQOPTIONS
This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Bioprocess Engineering Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The fresh feed to an ammonia synthesis reactor contains nitrogen, hydrogen and 2.0 mole per cent inerts. The molar ratio of H2:N2 is 3:1. The product stream consists of pure ammonia. Since conversion in the reactor is only 15%, a recycle stream is used and in order to avoid build-up of inerts, a purge stream is withdrawn. The rate of purge stream is adjusted to keep inert concentration in the recycle stream at 8 mole per cent. For a fresh feed rate of 100 moles/hr. Note that recycle stream contains only nitrogen, hydrogen and inerts. The N2:H2 ratio of 1:3 is maintained in every process stream, and calculate the number of moles, moles of inerts and moles of hydrogen in the recycle stream? |
| A. | 437 moles/hr, 35 moles/hr, 301.5 moles/hr |
| B. | 237 moles/hr, 30 moles/hr, 200 moles/hr |
| C. | 567 moles/hr, 35 moles/hr, 205 moles/hr |
| D. | 347 moles/hr, 30 moles/hr, 500 moles/hr |
| Answer» B. 237 moles/hr, 30 moles/hr, 200 moles/hr | |
| 2. |
The fresh feed to an ammonia synthesis reactor contains nitrogen, hydrogen and 2.0 mole per cent inerts. The molar ratio of H2:N2 is 3:1. The product stream consists of pure ammonia. Since conversion in the reactor is only 15%, a recycle stream is used and in order to avoid build-up of inerts, a purge stream is withdrawn. The rate of purge stream is adjusted to keep inert concentration in the recycle stream at 8 mole per cent. For a fresh feed rate of 100 moles/hr. Note that recycle stream contains only nitrogen, hydrogen and inerts. The N2:H2 ratio of 1:3 is maintained in every process stream, and calculate the moles of nitrogen entering the reactor and in the recycle stream? |
| A. | 125 moles/hr, 100.50 moles |
| B. | 135 moles/hr, 50 moles |
| C. | 125 moles/hr, 50 moles |
| D. | 185 moles/hr, 100.50 moles |
| Answer» B. 135 moles/hr, 50 moles | |
| 3. |
A solution of potassium dichromate in water contains 15% w/w Kr2Cr2O7. Calculate the amount of Kr2Cr2O7 that can be produced from 1500 kg of solution if 700 kg of water is evaporated and remaining solution is cooled to 293K. |
| A. | Data: Solubility of Kr2Cr2O7 at 293 K is 115 kg per 1000 kg of water. |
| B. | 158.875 kg |
| C. | 156.678 kg |
| D. | 145.478 kg |
| E. | 148.875 kg |
| Answer» B. 158.875 kg | |
| 4. |
Consider the following labeled flowchart for a simple chemical process based on reaction A -> B and predict the overall and single-pass conversion of the process? |
| A. | 100%, 70% |
| B. | 100%, 50% |
| C. | 100%, 75% |
| D. | 100%, 55% |
| Answer» D. 100%, 55% | |
| 5. |
Which of the following represents the figure corresponding to the stream? |
| A. | Recycle system |
| B. | By-pass system |
| C. | Purge system |
| D. | Recover stream |
| Answer» C. Purge system | |