單項(xiàng)選擇題The division of the kilowatt load between two AC generators operating in parallel is controlled by the settings and characteristics of the （）.
A.voltage regulators
B.field rheostats
C.reverse power relays
D.prime mover governors
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1.單項(xiàng)選擇題In a three-phase circuit, the phase voltages are （）
A.120°apart
B.160°apart
C.180°apart
D.360°apart
2.單項(xiàng)選擇題The frequency of an alternator at a given RPM is determined by the （）.
A.number of turns of wire in the armature coil
B.number of magnetic poles
C.strength of the magnets used
D.output voltage
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