单项选择题
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
单项选择题 A ground can be defined as an electrical connection between the wiring of a motor and its（）.
单项选择题 Brushless generators are designed to operate without the use of（）.
单项选择题 It （） for an emergency generator to require paralleling.
