單項(xiàng)選擇題The operation of （） two alternators requires the voltages to be equal and also in phase.
A.paralleling
B.series-mounting
C.running
D.control
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1.單項(xiàng)選擇題With a purely （） load the voltage and current are in phase, giving a power factor of one.
A.inductive
B.resistance
C.combined
D.capacitate
2.單項(xiàng)選擇題The separate supplies are connected in either star or delta formationThe star formation is most commonly used and requires（） slip-rings on the alternator.
A.two
B.three
C.four
D.five
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