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.
Mechanical Engineering
IC Engines and Nuclear Power Plants
Difficulty: Easy
Choose an option
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A15%
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B30%
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C50%
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D70%
Answer
Correct Answer: 30%
Explanation
ConceptConventional, 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 Answer30%