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
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A ground can be defined as an electrical connection between the wiring of a motor and its（）.
A.shunt field
B.circuit breaker
C.metal framework
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Brushless generators are designed to operate without the use of（）.
A.brushes
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单项选择题
It （） for an emergency generator to require paralleling.
A.is usual
B.is not usual
C.is necessary
D.is not impossible
