The voltage output of an AC generator is controlled by（）<br>A:varying the DC exciter voltage<br>B:varying the reluctance of the air gap<br>C:regulating the speed of the prime mover<br>D:shorting out part of the armature windings

The voltage output of an AC generator is controlled by（）
A:varying the DC exciter voltage
B:varying the reluctance of the air gap
C:regulating the speed of the prime mover
D:shorting out part of the armature windings

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