Q. Highest useful compression ratio is the compression ratio at which

(A) An engine can be safely operated
(B) An engine gives maximum thermal efficiency
(C) An engine operates smoothly
(D) Detonation first becomes audible

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✅ Correct Answer: (D) Detonation first becomes audible

Published by Mr. Dubey ⭐ 111.54K Points at 20-Sep-2023 12:24 pm in Heat Engines

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