MCQOPTIONS
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MCQOPTIONS
This section includes 9 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 system undergoing change in state from A to B along path ‘X’ receives 100 J heat and does 40 J work. It returns to state A from B along path ‘Y’ with work input of 30 J. Calculate the heat transfer involved along the path ‘Y’. |
| A. | – 60 J |
| B. | 60 J |
| C. | – 90 J |
| D. | 90 J |
| Answer» D. 90 J | |
| 2. |
A sealed rigid vessel has volume of 1 m3 and contains 2 kg of water at 100°C. The vessel is now heated. If a safety pressure valve is installed, at what pressure should the valve be set to have a maximum temperature of 200°C ? |
| A. | 431.3 kPa |
| B. | 531.3 kPa |
| C. | 631.3 kPa |
| D. | 731.3 kPa |
| Answer» B. 531.3 kPa | |
| 3. |
Calculate the change in enthalpy of carbon dioxide from 30 to 1500°C at 100 kPa at constant specific heat. |
| A. | 2237.7 kJ/kg |
| B. | 1637.7 kJ/kg |
| C. | 1237.7 kJ/kg |
| D. | 2337.7 kJ/kg |
| Answer» D. 2337.7 kJ/kg | |
| 4. |
A piston-cylinder device initially contains air at 150 kPa and 27°C. At this state, the volume is 400 litre. The mass of the piston is such that a 350 kPa pressure is required to move it. The air is now heated until its volume has doubled. Determine work done by the air. |
| A. | 120 kJ |
| B. | 130 kJ |
| C. | 100 kJ |
| D. | 140 kJ |
| Answer» E. | |
| 5. |
A piston-cylinder device initially contains air at 150 kPa and 27°C. At this state, the volume is 400 litre. The mass of the piston is such that a 350 kPa pressure is required to move it. The air is now heated until its volume has doubled. Determine the final temperature. |
| A. | 1400 K |
| B. | 400 K |
| C. | 500 K |
| D. | 1500 K |
| Answer» B. 400 K | |
| 6. |
Find the pressure of water at 200°C and having specific volume of 1.5 m3/kg. |
| A. | 0.9578 m3/kg |
| B. | 0.8578 m3/kg |
| C. | 0.7578 m3/kg |
| D. | 0.6578 m3/kg |
| Answer» B. 0.8578 m3/kg | |
| 7. |
A 5 m long vertical tube having cross sectional area 200 cm2 is placed in a water. It is filled with 15°C water, with the bottom closed and the top open to 100 kPa atmosphere. What is the pressure at the bottom of tube? |
| A. | 119 kPa |
| B. | 129 kPa |
| C. | 139 kPa |
| D. | 149 kPa |
| Answer» E. | |
| 8. |
A 5 m long vertical tube having cross sectional area 200 cm^2 is placed in a water. It is filled with 15°C water, with the bottom closed and the top open to 100 kPa atmosphere. How much water is present in tube? |
| A. | 99.9 kg |
| B. | 109.9 kg |
| C. | 89.9 kg |
| D. | 79.9 kg |
| Answer» B. 109.9 kg | |
| 9. |
A piston/cylinder with a cross-sectional area of 0.01 m^2 is resting on the stops. With an outside pressure of 100 kPa, what should be the water pressure to lift the piston? |
| A. | 178kPa |
| B. | 188kPa |
| C. | 198kPa |
| D. | 208kPa |
| Answer» D. 208kPa | |