RBSE SS Voc Automotive Practice Questions - Rajasthan RBSE Senior Secondary (Class 12) Vocational Automotive - Code 101 Exam

A high compression ratio in a spark-ignition petrol engine generally:

Always requires diesel fuel and glow plugs Eliminates the need for an exhaust system Reduces thermal efficiency because peak pressure falls Improves thermal efficiency but increases knock risk if fuel octane is too low

Correct Answer:

Improves thermal efficiency but increases knock risk if fuel octane is too low

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