MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 9 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 rigid container has 2kg of carbon dioxide gas at 1200 K, 100 kPa that is heated to 1400 K. Find the heat transfer using heat capacity. |
| A. | 231.2 kJ |
| B. | 241.2 kJ |
| C. | 251.2 kJ |
| D. | 261.2 kJ |
| Answer» E. | |
| 2. |
A 250L rigid tank contains methane at 1500 kPa, 500 K. It is now cooled down to 300K. Find the heat transfer. |
| A. | 402.4 kJ |
| B. | 502.4 kJ |
| C. | 602.4 kJ |
| D. | 702.4 kJ |
| Answer» C. 602.4 kJ | |
| 3. |
A vertical cylinder fitted with a piston contains 5 kg of R-22 at 10 C. Heat is transferred causing the piston to rise until the volume has doubled. Additional heat is transferred until the temperature inside reaches 50 C, at which point the pressure inside the cylinder is 1.3 MPa. Find the work done. |
| A. | 34.1 kJ |
| B. | 44.1 kJ |
| C. | 54.1 kJ |
| D. | 64.1 kJ |
| Answer» B. 44.1 kJ | |
| 4. |
10kg of water in a piston-cylinder exists as saturated liquid/vapour at 100 kPa, with a quality of 50%. It is now heated till the volume triples. The mass of piston is such that a cylinder pressure of 200 kPa will float it. Find the heat transfer in the process. |
| A. | 23961 kJ |
| B. | 24961 kJ |
| C. | 25961 kJ |
| D. | 26961 kJ |
| Answer» D. 26961 kJ | |
| 5. |
A steam turbine has an inlet of 2 kg/s water at 1000 kPa, 350 C and velocity of 15 m/s. The exit is at 100 kPa, x = 1 and very low velocity. Find the power produced. |
| A. | 664.6 kW |
| B. | 764.6 kW |
| C. | 864.6 kW |
| D. | 964.6 kW |
| Answer» E. | |
| 6. |
A steam turbine has an inlet of 2 kg/s water at 1000 kPa, 350 C and velocity of 15 m/s. The exit is at 100 kPa, x = 1 and very low velocity. Find the specific work. |
| A. | 382.3 kJ/kg |
| B. | 482.3 kJ/kg |
| C. | 582.3 kJ/kg |
| D. | 682.3 kJ/kg |
| Answer» C. 582.3 kJ/kg | |
| 7. |
Nitrogen gas flows into a convergent nozzle at 200 kPa, 400 K and very low velocity. It flows out of the nozzle at 100 kPa, 330 K. If the nozzle is insulated find the exit velocity. |
| A. | 681.94 m/s |
| B. | 581.94 m/s |
| C. | 481.94 m/s |
| D. | none of the mentioned |
| Answer» E. | |
| 8. |
Air at 600 K flows with 3 kg/s into a heat exchanger and out at 100 C. How much (kg/s) water coming in at 100 kPa, 20 C can the air heat to the boiling point? |
| A. | 0.37 kg/s |
| B. | 0.17 kg/s |
| C. | 0.27 kg/s |
| D. | 0.57 kg/s |
| Answer» D. 0.57 kg/s | |
| 9. |
Superheated R-134a at 0.5 MPa, 20 C is cooled in a piston-cylinder at constant temperature to a final two-phase state with quality of 50%. The refrigerant mass is 5 kg, and during the process 500 kJ of heat is removed. Find the necessary work. |
| A. | -67.9 kJ |
| B. | -77.9 kJ |
| C. | -87.9 kJ |
| D. | -97.9 kJ |
| Answer» D. -97.9 kJ | |