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BMCG 2133 THERMODYNAMICS TUTORIAL 03 FACULTY OF MECHANICAL ENGINEERING BMCG 2133 THERMODYNAMICS TUTORIAL 03 1. In what forms can energy cross the boundaries of a system? 2. When is the energy crossing the boundaries of a system as heat and when is it as work? 3. What is an adiabatic process? What is an adiabatic system? 4. What are the sign conventions for heat and work? 5. A gas in a piston-cylinder device is compresses, and as a result its temperature rises. Is this a heat or work interaction for the gas? 6. A room is heated by an iron, which left plugged in. Is this a heat or work interaction? Take the entire room, including the iron, as the system. 7. A room is heated as a result of solar radiation coming in through the windows. Is this a heat or work interaction for the room? 8. An insulated room is heated by burning candles. Is this a heat or work interaction? Take the entire room, including the candles, as a system. 9. What are point and path functions? Give examples. 10. What are mechanisms of heat transfer? 11. A frictionless piston-cylinder device contains 8 kg of superheated water vapor at 500 kPa and 300 o C. Steam is now cooled at constant pressure until 70 percent of it, by mass condenses. Determine the work done and heat transfer during this process.
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