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300 - FAA PPL(A) USA - A precaution for the operation of an engine equipped with a constant-speed propeller is to

Question 300 - Preflight Preparation - FAA PPL(A) - Private Pilot Airplane

avoid high RPM settings with high manifold pressure
avoid high manifold pressure settings with low RPM
always use a rich mixture with high RPM settings

Training tests and timed exam simulations FAA PPL(A) - Private Pilot Airplane