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单选题The DC excitation to the field of brushless synchronous is generally produced by （）A an exciter driven by the same shaft with the generatorB an exciter driven by external prime moverC generator itselfD either A and B

题目
单选题
The DC excitation to the field of brushless synchronous is generally produced by （）
A

an exciter driven by the same shaft with the generator

B

an exciter driven by external prime mover

C

generator itself

D

either A and B

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相似问题和答案

第1题：

An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard as a

A.magnetic amplifier

B.ship's service alternator

C.three-wire DC generator

D.saturable core reactor


正确答案：B

第2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3题：

In an AC.synchronous motor electric propulsion plant,propeller speed is controlled by()

A.prime mover speed

B.number of energized main motor poles

C.propulsion generator field strength

D.electric coupling field strength


答案：C

第4题：

jim has created a field hint for the address field. Users tell him this text disappears when they click in the address field. which one of the following is most likely reason?（）

  • A、 the address field is computed 
  • B、 jim should have used a text popup       
  • C、 jim stored the field hint in the database    
  • D、 field hint only display when the user has not clicked in the field （field hint）

正确答案:D

第5题：

Brushless generators are designed to operate without the use of_____.

A.brushes

B.slip rings

C.commutators

D.all of the above


正确答案：

第6题：

The division of kilowatt load between two paralleled alternators is determined by the

A.amount of field excitation of the leading machine

B.load-speed characteristics of the governors

C.amount of field excitation to the lagging machine

D.type of alternator


正确答案：B

第7题：

肾病综合征病人的尿蛋白大多( )A、>3.5g／dB、>2.0g／dC、<3.5g／dD、<2.0g／dE、<1.0g／d

肾病综合征病人的尿蛋白大多( )

A、>3.5g/d

B、>2.0g/d

C、<3.5g/d

D、<2.0g/d

E、<1.0g/d


参考答案：A

第8题：

兴奋－收缩耦联(excitation－contraction coupling) 名词解释


参考答案：把肌膜电兴奋和肌细胞收缩过程联系起来的中介过程。

第9题：

Synchronous同步


正确答案: 任何通信系统中要求发送方在发送数据前必须与接收方协调（即同步）的特性。同步通常是在无数据提供时发送硬件传送一个标准脉冲来处理，接收方利用该脉冲来决定起始结束位。

第10题：

SONET全称为（）

  • A、synchronous optimized network
  • B、synchronous optical network
  • C、synthesis optimized network
  • D、synthesis optical network

正确答案:B

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