Aircraft systems and instrumentsQuestion 667 of 934

The alternator half of the master switch is turned OFF. What is the result?

  1. The battery is disconnected
  2. The whole electrical load is on the generator
  3. The ignition system stops
  4. The whole electrical load is on the battery
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Correct answer: The whole electrical load is on the battery

The pilot should turn off all nonessential electrical equipment to save battery power.

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