The initial voltage of self-excitation generator set up by（）

A、residual magnetism

B、voltage regulator

C、electrical current for excitation

D、the other running generator

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更多“The initial voltage of self-excitation generator set up by（）”相关的问题

第1题

[] The output voltage of a three-phase alternator is regulated by the （）.

A、A.AC voltage to the armature B、B.AC voltage to the field C、C.DC voltage to the armature D、D.DC voltage to the field

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第2题

[单选题] Possible phase relationships between voltage and current in an alternating current circuit include which of the following conditions?（）

A、Current and voltage may be in phase B、Current may lead the voltage C、Current may lag the voltage D、All of the above

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第3题

[单选题] AC voltmeters are generally calibrated to read the （）

A、instantaneous voltage B、average voltage C、RMS voltage D、peak voltage

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第4题

[单选题] Which of the following statements concerning a simple parallel resistance circuit is correct?（）

A、The voltage drop across each resistor is the same B、The total current flow equals the reciprocal of the sum of the individual currents C、The total resistance equals the sum of the individual resistances D、The total voltage equals the sum of the individual voltages across each resistance

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第5题

[单选题] The instantaneous reduction in voltage of an AC generator, resulting from an increase in load, and prior to the automatic voltage regulator correcting the situation, is called voltage （）.

A、droop B、drop C、dip D、regulation

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第6题

[] Which of the listed items will stop a motor due to a reduction in voltage and restart it when the voltage is restored to normal?（）

A、A.Low voltage protection circuit B、B.Non-renewable link fuse C、C.Renewable link fuse D、D.Low voltage release circuit

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第7题

[单选题] The voltage output of an AC generator is controlled by（）

A、varying the DC exciter voltage B、varying the reluctance of the air gap C、regulating the speed of the prime mover D、shorting out part of the armature windings

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第8题

[] The voltage developed by an AC generator is controlled by varying the （）

A、A.speed of the prime mover B、B.AC excitation to the field C、C.DC excitation to the field D、D.DC excitation of the voltage regulator

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第9题

[单选题] The output voltage of a 440 volt, 60 hertz, AC generator is controlled by the （）.

A、prime mover speed B、exciter output voltage C、load on the alternator D、number of poles

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