搜题

【单项选择题】

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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更多“The voltage developed by an AC generator is controlled by varying the （）”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] When voltage and current developed in an AC circuit reach their peak values at the same time, the power factor is （）

A、lagging B、leading C、maximum D、minimum

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第3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4题

[单选题] The primary function of an electric motor is to （）

A、develop torque B、generate high voltages C、produce a magnetic field D、generate high electrical resistance

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第5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6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7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8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9题

[] You copy a Web site from a development site to a staging site. You do not have the Web site in a source control application. Another developer begins to fix bugs on the staging site while the development team adds features on the development site. You need to synchronize the development site and the staging site and copy the latest version of each file to both locations. What should you do?（） You copy a Web site from a development site to a staging site. You do not have the Web site in a source control application. Another developer begins to fix bugs on the staging site while the development team adds features on the development site. You need to synchronize the development site and the staging site and copy the latest version of each file to both locations. What should you do?（）

A、A. Use the Copy Web tool. B、B. Create a Web Setup project. C、C. Use the Publish Web tool. D、D. Use the command line to XCOPY the files.

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