海船船员考试

单选题The purpose of the commutator and brushes on a DC generator is to()A change AC to DCcurrentB change DC to AC currentC neutralize a armature reactionD carry current to the outside circuit

题目
单选题
The purpose of the commutator and brushes on a DC generator is to()
A

change AC to DCcurrent

B

change DC to AC current

C

neutralize a armature reaction

D

carry current to the outside circuit

参考答案和解析
正确答案: B
解析: 暂无解析
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相似问题和答案

第1题:

describe the procedure to start an emergency generator ?


正确答案:1) to check the lube oil level in the crankcance and fuel oil level in the tank . 2) to see whether there is any leakage . 3) to check the air pressure if the generator is air started model ; and to check the battery voltage to see whether it is normal if the generator is the battery started model 4)also to make sure there are no obstacles around the machine .

第2题:

The boy brushes his ________(牙齿) every day.


正确答案:
 33. teeth

第3题:

The child brushes her ______ every day.

A、tooths

B、teeth

C、teeths

D、tooth


参考答案: B

第4题:

画笔(Brushes)调板中共包含四种类型的笔刷,下列哪项不包含其中?()

  • A、书法效果画笔(Calligraphic Brushes)
  • B、散点画笔(Scatter Brushes)
  • C、边线画笔(Stroke Brushes)
  • D、图案画笔(Pattern Brushes)

正确答案:C

第5题:

金风2.5WM机组The Switch变流器机侧整流器控制盒内,槽位A安装的是数字量输入板,其DIN2端口接入的信号为()。

  • A、lightning protection OK
  • B、DC-Link overvoltage protection OK
  • C、Generator breakr trip
  • D、Ventilation conditions  OK

正确答案:B

第6题:

Which of the following components are used to convert alternating current produced in the generator windings to direct current?

A.Armature and equalizer

B.Commutator and brushes

C.Rotor and interpoles

D.Field and exciter


正确答案:B

第7题:

At six o-clock she gets up,then brushes her____(tooth).


正确答案:
35.teeth

第8题:

In a modern three-phase A.C. synchronous brushes generator, the excitation winding is on the rotor. That means .

A.The generator need not excitation.

B.The winding on the rotor is for inputting excitation current.

C.There are three phase windings on the rotor.

D.The generator has no brushes.


正确答案:B

第9题:

画笔(Brushes)调板中包含边线画笔(Stroke Brushes)()


正确答案:错误

第10题:

下列有关画笔(Brushes)调板描述不正确的是:()

  • A、在画笔(Brushes)调板中包含四种类型的画笔:书法效果画笔(Calligraphic Brushes)、散点画笔(Scatter Brushes)、艺术画笔(Art Brushes)和图案画笔(Pattern Brushes)
  • B、在新建散点画笔(Scatter Brushes)之前,必须在页面上选择一个图形,此图形中可以包含使用画笔效果的路径,渐变色以及渐层网格等图形
  • C、艺术画笔(Art Brushes)在新建之前,工作页面上必须有选中的图形,且此图形中不包含使用画笔设置的路径
  • D、在图案画笔(Pattern Brushes)的对话框中,需要设定五部分图案,分别为:图案周边、外拐角、内拐角、开头和结尾

正确答案:B,C

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