Exam-style question
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What is the primary difference between an ideal engine cycle and a practical engine cycle?.
- A.An ideal engine cycle operates without any friction.
- B.A practical engine cycle includes energy losses due to friction and heat.
- C.An ideal engine cycle is more efficient than a practical engine cycle.
- D.A practical engine cycle can achieve the maximum theoretical efficiency.
Model answer
What a good answer should say
- A practical engine cycle includes energy losses due to friction and heat.
Explanation
Why this works
An ideal engine cycle is defined as a theoretical model that operates without any losses, while a practical engine cycle accounts for real-world inefficiencies such as friction and heat loss. The key difference is that ideal cycles assume perfect efficiency, whereas practical cycles reflect the actual performance of engines.
Ideal cycles apply in theoretical scenarios, while practical cycles are relevant in real-world applications. Thus, the correct option highlights the energy losses present in practical cycles.
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