The output voltage of a 440 volt, 60 hertz, AC generator is controlled by the （）.<br>A:prime mover speed<br>B:exciter output voltage<br>C:load on the alternator<br>D:number of poles

The output voltage of a 440 volt, 60 hertz, AC generator is controlled by the （）.
A:prime mover speed
B:exciter output voltage
C:load on the alternator
D:number of poles

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