题目内容

对空心杯转子异步测速发电机，正确的说法是：当转子转动时，在输出绕组中感应的()。

A. 电动势大小正比于杯形转子的转速，而频率与转速有关
B. 电动势大小正比于杯形转子的转速，而频率与励磁电压频率无关
C. 电动势大小正比于杯形转子的转速，而频率与励磁电压频率相同，与转速无关
D. 电动势大小及频率正比于杯形转子的转速

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