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單項(xiàng)選擇題

To equalize the power factor of two alternators operating in parallel, the （）

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

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單項(xiàng)選擇題

An advantage of DC motors over AC motors is that they （）

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

單項(xiàng)選擇題

Which of the following devices are protected from being motorized by a reverse-power relay?（）

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

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