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583 - ATPL - The relationship between compression ratio of a piston engine and the required fuel octane rating is that the:

Question 583 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Higher the compression ratio, the lower the octane rating required.
Lower the compression ratio, the higher the octane rating required.
Higher the compression ratio, the higher the octane rating required.
Required octane rating is independent of the compression ratio.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license