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Aircraft systems and instrumentsQuestion 619 of 934

How does a magneto produce electrical current?

  1. It draws current from the battery through the switch
  2. It draws current from the alternator after start
  3. It draws current from the master bus bar
  4. From a permanent magnet, with no outside power
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Correct answer: From a permanent magnet, with no outside power

A magneto works independently of the aircraft electrical system. It fires when the crankshaft turns.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Ignition System, page 175

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026