单项选择题

Equal power factors on paralleled AC generators are maintained by an automatic （）.

A.voltage regulator
B.reverse power relay
C.reverse current relay
D.governor control switch

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单项选择题

A.field excitation of both units is adjusted
B.governors of both units are adjusted
C.phase sequence is altered
D.kilowatt load is evenly divided

单项选择题

A.are less expensive
B.require less maintenance
C.can be started across the line
D.offer a more effective means of controlling speed

单项选择题

A.Alternators
B.Wave guides
C.Exciters
D.Amplidynes