單項選擇題

Any electric motor can be constructed to be（）.

A.short proof
B.ground proof
C.explosion proof
D.overload proof

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單項選擇題

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

單項選擇題

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

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