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單項選擇題

The field coils（） and the armature is（）This is in fact the arrangement adopted for large, heavy duty alternators.

A.stationary；rotate
B.stationary；stationary
C.rotate；stationary
D.rotate；rotate

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單項選擇題

The power factor is a measure of the phase difference between voltage and current and is expressed as the（） of the phase angle.

A.sine
B.cosine
C.tangent
D.cotangent

單項選擇題

With a purely resistance load the voltage and current are in phase, giving a power factor of （）.

A.one
B.less than one
C.more than one
D.negative one

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