单项选择题
The division of kilowatt load between two paralleled alternators is determined by the （）
A.amount of field excitation of the leading machine
B.load-speed characteristics of the governors
C.amount of field excitation to the lagging machine
D.type of alternator
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相关考题
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单项选择题
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 -
单项选择题
In a three-phase circuit, the phase voltages are （）
A.120°apart
B.160°apart
C.180°apart
D.360°apart -
单项选择题
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
