Exam-style question
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What is a primary reason for energy losses in real engines?.
- A.Friction and heat dissipation
- B.Perfect insulation
- C.Constant pressure operation
- D.Use of high-quality materials
Model answer
What a good answer should say
- Friction and heat dissipation
Explanation
Why this works
The cause of energy losses in real engines is the presence of friction and heat dissipation. The mechanism involves the conversion of mechanical energy into thermal energy due to friction between moving parts and heat loss to the surroundings.
The effect is that less energy is available for useful work, resulting in the consequence that the overall efficiency of the engine is reduced.
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