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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更多“Equal power factors on paralleled AC generators are maintained by an automatic （）.”相关的问题

第1题

[] （）is a function of the reactive / resistive characteristics of the load items and cannot be adjusted by manipulating the alternator control devices.

A、A.Power factor B、B.Power ratio C、C.compression ratio D、D.Compression factor

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第2题

[单选题] Which of the following factors is the MOST important to consider when choosing an uninterruptible power supply （UPS） for a single server？（）

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

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第3题

[单选题] The （） is a measure of the phase difference between voltage and current and is expected as the cosine of phase angle.

A、power B、efficiency C、effective power D、power factor

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第4题

[] Why is it desirable to operate paralleled AC generators at the same power factor?（）

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5题

[单选题] To （） , the power is supplied by main switchboard directly not though sub-board.

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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第6题

[单选题] Which of the following factors is the MOST likely cause of a power supply fan failure?（）

A、Extreme temperature variances B、Extreme humidity variances C、Power stability fluctuations D、Excessive dust accumulation

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第7题

[单选题] When you are making a high potential test on a piece of repaired electrical machinery, a rise in leakage current indicates （）.

A、good insulation B、bad insulation C、high insulation power factor D、a high slot discharge factor

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第8题

[] In today’s practice, with cylinders of equal diameter of bore and equal revolutions, the two-cycle engine delivers a power about 80 percent （） than that of the four-stroke one.

A、A.greater B、B.better C、C.smaller D、D.less