Practice question

What is the primary purpose of the main rectifier diode assembly inside an automotive alternator?

  1. To step up the voltage from 12V to 24V.
  2. To convert (rectify) the Alternating Current (AC) generated by the alternator into Direct Current (DC) required by the vehicle's electrical system.
  3. To act as an electrical fuse for the starter motor.
  4. To control the engine idle speed.

Answer: B — To convert (rectify) the Alternating Current (AC) generated by the alternator into Direct Current (DC) required by the vehicle's electrical system.

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