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单项选择题

The star formation is most commonly used and requires（） on the alternator.

A.one slip-ring
B.two sliprings
C.three sliprings
D.four sliprings

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单项选择题
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
单项选择题
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
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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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