To increase the frequency of an operating AC generator, you should （）<br>A:increase the field excitation<br>B:decrease the field excitation<br>C:increase the number of magnetic poles<br>D:increase the speed of the prime mover

To increase the frequency of an operating AC generator, you should （）
A:increase the field excitation
B:decrease the field excitation
C:increase the number of magnetic poles
D:increase the speed of the prime mover

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