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單項(xiàng)選擇題

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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單項(xiàng)選擇題

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
D.inter-pole

單項(xiàng)選擇題

Brushless generators are designed to operate without the use of（）.

A.brushes
B.slip rings
C.commutators
D.all of the above

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