MCQOPTIONS
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MCQOPTIONS
This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A constant pressure piston/cylinder contains 2 kg of water at 5 MPa and 100 C. Heat is added from a reservoir at 700 C to the water until it reaches 700 C. Find the total irreversibility in the process. |
| A. | 1572 kJ |
| B. | 1672 kJ |
| C. | 1772 kJ |
| D. | 1872 kJ |
| Answer» B. 1672 kJ | |
| 2. |
Which law is used for exergy balance? |
| A. | first law |
| B. | second law |
| C. | first law and second law |
| D. | third law |
| Answer» D. third law | |
| 3. |
For an isolated system, the exergy balance gives |
| A. | A=-I |
| B. | A=I |
| C. | A=0 |
| D. | none of the mentioned |
| Answer» B. A=I | |
| 4. |
For a closed system, availability or exergy transfer occurs through |
| A. | heat interactions |
| B. | work interactions |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 5. |
Since irreversibility > 0, the only processes allowed by the second law are those for which the exergy of the isolated system |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | none of the mentioned |
| Answer» C. remains constant | |
| 6. |
Which of the following clearly defines availability or exergy? |
| A. | it is the maximum useful work obtainable from a system as it reaches the dead state |
| B. | it is the minimum work required to bring the closed system from the dead state to the given state |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |