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Aircraft systems and instrumentsQuestion 671 of 934

What does a voltage regulator do?

  1. It limits the engine rpm to a safe value
  2. It protects the circuits from overload and shorts
  3. It distributes power from the bus bar to the equipment
  4. It stabilizes alternator output and controls charge rate
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Correct answer: It stabilizes alternator output and controls charge rate

The generator or alternator voltage should be higher than the battery voltage to keep the battery charged.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Electrical System, page 191

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026