The output voltage of a 440 volt, 60 hertz, AC generator is controlled by theA.prime mover speedB.exciter output voltageC.load on the alternatorD.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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【单选题】（）供给空调设备、空气压缩机、牵引电机通风机、牵引变压器风机、牵引变流器通风机、开水炉、餐车设备等使用A．单相AC440VB．单相AC220VC．三相AC440V