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Typical thermal efficiency of diesel engines (textbook value) Select the closest approximate overall thermal efficiency commonly quoted for conventional diesel engines. Choose the correct option.

Difficulty: Easy

Correct Answer: 30%

Explanation:

Concept
Conventional, naturally aspirated diesel engines typically show overall brake thermal efficiency around 25–35%, with practical textbook figures commonly cited near 30%. Large, slow-speed diesels can be higher, but 30% is the standard MCQ benchmark.

Final Answer
30%

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