The voltage developed by an AC generator is controlled by varying the （）<br>A:speed of the prime mover<br>B:AC excitation to the field<br>C:DC excitation to the field<br>D:DC excitation of the voltage regulator

The voltage developed by an AC generator is controlled by varying the （）
A:speed of the prime mover
B:AC excitation to the field
C:DC excitation to the field
D:DC excitation of the voltage regulator

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