Which of the following has the least thermal efficiency ?
Correct answer: A. Steam engine
- A. Steam engine
- B. Carnot engine
- C. Diesel engine
- D. Otto engine
Explanation
A practical steam engine generally has the lowest thermal efficiency because much heat is rejected and its expansion is less efficient than in idealized or modern internal-combustion cycles. The Carnot cycle represents the maximum possible efficiency between two temperatures.
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