Exam-style question
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Explain when expansion work and compression work occur in a thermodynamic cycle.
Model answer
What a good answer should say
- Expansion work occurs during the phase when a gas expands, pushing against external pressure, such as in the power stroke of an engine.
- Compression work occurs when the gas is compressed, such as during the intake stroke, where work is done on the gas to reduce its volume.
Explanation
Why this works
This answer effectively explains the contexts in which each type of work occurs, demonstrating an understanding of thermodynamic cycles. It tests the application of concepts in real-world scenarios, reinforcing the importance of these processes in engine operation.
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