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The output voltage of a 440 volt, 60 hertz, AC generator is

题目
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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相似问题和答案

第1题：

Overspeed of the diesel engine driving an electric generator could cause ______.

A.low voltage trip

B.reverse power trip

C.damage to windings

D.excessive exhaust temperatures


正确答案：C
柴油机超速驱动一发电机可能引起对卷损坏。

第2题：

CRH380B型动车组的辅助供电方式三相为（）。

  • A、AC24V/50HZ
  • B、AC110V/50HZ
  • C、AC220V/60HZ
  • D、AC440V/60HZ

正确答案:D

第3题：

( ) can provide an asynchronous link between two ac electric power system with different nominal frequencies.

A.The HVDC (high voltage DC) transmission

B.The EHV (extra-high voltage) AC transmission

C.The AC distribution

D.Generators


参考答案：A

第4题：

单选题
The purpose of DC generator brushes is to （）.
A

neutralize armature reaction

B

conduct electric current to an outside circuit

C

convert DC current to AC current

D

provide excitation to a DC generator


正确答案： D
解析： 暂无解析

第5题：

CONVERTER的输出是什么？

  • A、250 Amps of 28 VDC regulated。
  • B、23 KVA， 115 volt AC, 3 phase, 400 hertz。
  • C、23 KVA，115 volt AC, 3 phase, 400 hertz ；250 Amps of 28 VDC regulated
  • D、都不对。

正确答案:C

第6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


正确答案：B

第7题：

A technician arrives in Germany and discovers that when their PC is plugged into the outlet, nopower is received. Which of the following actions should the technician take to get the PC tooperate?（）

  • A、Change the BIOS settings to the local time
  • B、Adjust the voltage selector switch
  • C、Attach a 220 volt power strip from the current region to the PC
  • D、Attach a 120 volt battery backup power supply to the PC

正确答案:B

第8题：

The generator voltages are usually stepped up to the transmission voltage level by ( ).

A.series capacitor

B.parallel reactors

C.step-up transformers

D.step-down transformers


参考答案：C

第9题：

单选题
The output voltage of a three-phase alternator is regulated by the （）.
A

AC voltage to the armature

B

AC voltage to the field

C

DC voltage to the armature

D

DC voltage to the field


正确答案： C
解析： 暂无解析

第10题：

单选题
A DC generator is used to supply direct current in order to maintain an AC generator field and is known as a/an （）
A

rotor

B

stator

C

exciter

D

armature


正确答案： C
解析： 暂无解析

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