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單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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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