Which statement about the alternator's voltage regulator is false?

Which statement about the alternator's voltage regulator is false?

• A. It maintains a constant output voltage despite engine speed changes.
• B. It helps match the alternator output to the electrical load.
• C. It prevents overcharging the battery by controlling field current.
• D. It directly converts AC to DC.

Answer: (D)

The voltage regulator’s job is to keep the electrical system voltage steady by controlling the rotor’s field current. It senses the system voltage and adjusts excitation so the output stays around the target value, even as engine speed or electrical load changes. This regulation lets the alternator supply more current when demand rises and reduces it when demand falls, helping prevent under- or overcharging. The conversion from alternating current to direct current is done by the rectifier diodes, not by the regulator. So the statement that the regulator directly converts AC to DC is not correct.

The voltage regulator’s job is to keep the electrical system voltage steady by controlling the rotor’s field current. It senses the system voltage and adjusts excitation so the output stays around the target value, even as engine speed or electrical load changes. This regulation lets the alternator supply more current when demand rises and reduces it when demand falls, helping prevent under- or overcharging. The conversion from alternating current to direct current is done by the rectifier diodes, not by the regulator. So the statement that the regulator directly converts AC to DC is not correct.