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【单选题】

The power factor at which a paralleled AC generator operates is usually adjusted by the ().

A、connected load

B、prime mover speed

C、field excitation

D、generators rated voltage

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第5题

A、A.Circulating currents are kept to a minimum  B、B.Field excitation losses are kept to a minimum  C、C.Generator rotors will have a lesser tendency to hunt  D、D.Because a power factor increase will decrease kilowatt output  

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第7题

A、 UPS form factor  B、 Server form factor  C、 Server power supplys wattage rating  D、 Desired runtime  

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第8题

A、save network cost  B、improve the reliability of supplying power to important load  C、prevent sequence reverse  D、increase the power factor of important load  

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