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單項選擇題

Which of the following types of motors is often designed for use in correcting power factor?（）

A.Polyphase
B.Wound-rotor
C.Induction
D.Synchronous

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單項選擇題

Power transformers are rated in （）.

A.kilowatts
B.ampere-turns
C.kilowatt-volts
D.kilovolt-amperes

單項選擇題

The purpose of DC generator brushes is to （）.

A.neutralize armature reaction
B.conduct electric current to an outside circuit
C.convert DC current to AC current
D.provide excitation to a DC generator