单项选择题
A.one slip-ring B.two sliprings C.three sliprings D.four sliprings
The field coils() and the armature is()This is in fact ...
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
The power factor is a measure of the phase difference b...
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
With a purely resistance load the voltage and current a...
单项选择题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