The power factor of an AC generator operating singularly is determined by the （）

A、A.connected load

B、B.prime mover speed

C、C.field excitation

D、D.generators rated voltage

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更多“The power factor of an AC generator operating singularly is determined by the （）”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] 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3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4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5题

[单选题] The frequency of the alternating current generated by a synchronous generator is governed by the speed and the（）

A、full excitation B、load C、power factor D、number of poles

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第6题

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

A、sine B、cosine C、tangent D、cotangent

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第7题

[单选题] The load between two steam-driven alternators operating in parallel may be adjusted by varying （）

A、the speed of the alternators B、the field strength of the machines C、the power factor of the alternators D、steam supply to the prime movers