aircraft systemsFAA-published question bank (Private Pilot, 2008)
A precaution for the operation of an engine equipped with a constant-speed propeller is to
A
avoid high RPM settings with high manifold pressure.
B
avoid high manifold pressure settings with low RPM.✓ Correct Answer
C
always use a rich mixture with high RPM settings.
Explanation
PHAK Chapter 7 cautions against combining high manifold pressure with low RPM, which can overstress the cylinders and cause detonation; to increase power, raise RPM before manifold pressure, and to reduce it, lower manifold pressure first. High RPM with high manifold pressure is normal takeoff power, and the mixture should be set as the POH directs, not always rich.
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