单项选择题

The operation of paralleling two alternators requires the voltages to be （）and also in phase.

A.zero
B.eliminated
C.different
D.equal

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单项选择题
The （） is a measure of the phase difference between voltage and current and is expected as the cosine of phase angle.

A.power
B.efficiency
C.effective power
D.power factor
单项选择题
The overcurrent relay （） the motor contactor when the motor exceeds its rated current.

A.connects
B.trips
C.fouls
D.destructs
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