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Aircraft systems and instrumentsQuestion 585 of 934

A pilot sets 2,300 rpm at 5,000 feet. How does the power compare with 2,300 rpm at sea level?

  1. It is more, because the air density is lower
  2. It is the same, because the rpm is the same
  3. It is less, because the air density is lower
  4. It is the same, because the throttle is open
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Correct answer: It is less, because the air density is lower

Power output depends on air density. Air density decreases as altitude increases.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Propeller — Fixed-Pitch Propeller, page 165

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026