MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A piston-cylinder has the piston loaded with outside atmospheric pressure and piston mass to a pressure of 150 kPa. It contains water at −2°C, which is heated until the water becomes saturated vapour. Find the specific work for the process. |
| A. | 163.7 kJ/kg |
| B. | 173.7 kJ/kg |
| C. | 183.7 kJ/kg |
| D. | 193.7 kJ/kg |
| Answer» C. 183.7 kJ/kg | |
| 2. |
A reactor filled with water having volume 1 m3 is at 360°C, 20 MPa and placed inside a containment room which is well insulated and initially evacuated. Due to a failure, the reactor ruptures and water fills the room. Find the minimum room volume so that the final pressure does not exceed 200 kPa. |
| A. | 257.7 m3 |
| B. | 267.7 m3 |
| C. | 277.7 m3 |
| D. | 287.7 m3 |
| Answer» E. | |
| 3. |
An insulated cylinder fitted with a piston contains R-12 at 25°C with a quality of 90% and V=45 L. The piston moves and the R-12 expands until it exists as saturated vapour. During this, R-12 does 7kJ of work against the piston. Determine the final temperature, assuming that the process is adiabatic. |
| A. | -5°C |
| B. | -15°C |
| C. | -25°C |
| D. | -35°C |
| Answer» C. -25°C | |
| 4. |
A 25 kg mass moving with 25 m/s is brought to a complete stop with a constant deceleration over a period of 5 seconds by a brake system. The brake energy is absorbed by 0.5kg water initially at 100 kPa, 20°C. Assume that the mass is at constant P and T. Find the energy the brake removes from the mass assuming P = C. |
| A. | 7.6125 kJ |
| B. | 7.7125 kJ |
| C. | 7.8125 kJ |
| D. | 7.9125 kJ |
| Answer» D. 7.9125 kJ | |
| 5. |
2kg water at 120°C with a quality of 25% has its temperature raised 20°C in a constant volume process. What is the heat transfer in the process? |
| A. | 877.8 kJ |
| B. | 887.8 kJ |
| C. | 897.8 kJ |
| D. | 907.8 kJ |
| Answer» B. 887.8 kJ | |
| 6. |
A cylinder with constant volume of 0.1 L contains water at critical point. It then cools down to room temperature of 20°C. Calculate the heat transfer from the water. |
| A. | -61.7 kJ |
| B. | -71.7 kJ |
| C. | -81.7 kJ |
| D. | -91.7 kJ |
| Answer» B. -71.7 kJ | |
| 7. |
Water in a 150L closed, rigid tank is at 100°C, 90% quality. The tank is cooled to −10°C. Calculate the heat transfer during this process. |
| A. | -163.3 kJ |
| B. | -263.3 kJ |
| C. | -363.3 kJ |
| D. | -463.3 kJ |
| Answer» C. -363.3 kJ | |
| 8. |
Ammonia at 0°C, quality 60% is contained in a 200L tank. The tank and ammonia is now heated to a final pressure of 1 MPa. Determine the heat transfer for the process. |
| A. | 520.75 kJ |
| B. | 620.75 kJ |
| C. | 720.75 kJ |
| D. | 820.75 kJ |
| Answer» D. 820.75 kJ | |
| 9. |
A cylinder fitted with a piston contains 2kg of superheated R-134a vapour at 100°C, 350 kPa. The cylinder is then cooled so that R-134a remains at constant pressure till it reaches a quality of 75%. Calculate the heat transfer in this process. |
| A. | -174.6 kJ |
| B. | -274.6 kJ |
| C. | -374.6 kJ |
| D. | -474.6 kJ |
| Answer» C. -374.6 kJ | |
| 10. |
A rigid container has 0.75kg water at 1200 kPa, 300°C. Now, the water is cooled to a final pressure of 300 kPa. Find the heat transfer in the process. |
| A. | -2348 kJ |
| B. | -1348 kJ |
| C. | -2148 kJ |
| D. | -1148 kJ |
| Answer» E. | |