Aircraft systems and instrumentsQuestion 587 of 934

What does the propeller control of a constant-speed propeller regulate?

  1. Manifold pressure
  2. Fuel flow
  3. Oil pressure
  4. Engine rpm
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Correct answer: Engine rpm

The throttle controls power output. The propeller control regulates engine rpm.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Propeller — Adjustable-Pitch Propeller, page 166

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Questions last reviewed: 18 October 2026