MCQOPTIONS
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MCQOPTIONS
This section includes 4 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Steam enters a turbine at 550 C, 25 MPa and exits at 5 MPa, 325 C at a flow rate of 70 kg/s. Determine the second law efficiency. |
| A. | 0.68 |
| B. | 0.78 |
| C. | 0.88 |
| D. | 0.98 |
| Answer» D. 0.98 | |
| 2. |
A heat pump has a COP of 2 using a power input of 2 kW. Its low temperature is To and high temperature is 80 C, with an ambient at To. Find the second law efficiency. |
| A. | 0.11 |
| B. | 0.41 |
| C. | 0.51 |
| D. | 0.31 |
| Answer» E. | |
| 3. |
A steam turbine inlet is at 1200 kPa and 500 C. The actual exit is at 300 kPa having an actual work of 407 kJ/kg. Find its second law efficiency? |
| A. | 0.88 |
| B. | 0.98 |
| C. | 0.78 |
| D. | 0.68 |
| Answer» C. 0.78 | |
| 4. |
As Ta approaches Tr, second law efficiency |
| A. | half |
| B. | first law efficiency |
| C. | zero |
| D. | unity |
| Answer» E. | |