【判断题】【消耗次数:1】
三相异步电动机的转子回路串电阻并不改变同步转速。
正确
错误
参考答案:
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相关题目
【判断题】 三相异步电动机在进入回馈制动时,电动机转子的转速低于同步转速。
①  正确
②  错误
【单选题】 三相异步电动机转子的转速( )旋转磁场的转速。
①  低于
②  高于
③  等于
【判断题】 三相异步电动机转子的转速低于旋转磁场的转速。
①  正确
②  错误
【判断题】 绕线式转子三相异步电动机在转子中串电阻调速属于恒转矩调速。
①  正确
②  错误
【单选题】 三相异步电动机转子实际转速超过同步转速的一种制动状态是( )。
①  能耗制动
②  机械制动
③  反接制动
④  回馈制动
【判断题】 三相异步电动机的转子与定子旋转磁场以相同的方向、不同的转速旋转,存在转差率,所以叫三相异步电动机。
①  正确
②  错误
【判断题】 三相异步电动机的同步转速和转轴速度一样?
①  正确
②  错误
【单选题】 三相异步电动机旋转磁场的转速与( )有关。
①  负载大小
②  定子绕组上电压大小
③  电源频率
④  三相转子绕组所串电阻的大小
【单选题】 绕线式三相异步电动机,转子回路中可以外串三相对称电阻,以增大电动机的启动转矩,启动结束后可以切除外串电阻,电动机的效率从而受到受影响。
①  正确
②  错误
【单选题】 三相异步电动机由定子、转子、气隙组成。
①  正确
②  错误
随机题目
【单选题】 In no circumstance __________ .
①  smoking should be allowed on the campus
②  should smoking be allowed on the campus
③  should smoking allowed on the campus
④  should smoking allow on the campus
【单选题】 Do you mind if I join you?
①  I’m very happy to do so
②  Never mind
③  Please do
④  Oh, I can’t
【单选题】 Hi, Sam, I think you did a good jo@@
①  Thank you
②  Don’t mention it
③  Not at all
④  I did it quite badly
【单选题】 We are interested in the weather because it __________ us so directly --- what we wear, what we do, and even how we feel.
①  benefits
②  affects
③  guides
④  effects
【单选题】 If the whole program __________ beforehand, a great deal of time and money would have been lost.
①  was not planned
②  were not planned
③  would not be planned
④  had not been planned
【单选题】 She’s an only child, but they didn’t really __________ her.
①  hurt
②  damage
③  spoil
④  harm
【单选题】 I was stunned by the news, and my initial __________ was anger.
①  impression
②  reaction
③  comment
④  other
【单选题】 Do you mind telling me where you’re from?
①  Certainly. I’m from London
②  Sure. I was born in London
③  Not really, you can do it
④  Certainly not. I’m from London
【单选题】 It was not until she had arrived home __________ remembered her appointment with the doctor.
①  when she
②  that she
③  and she
④  she
【单选题】 If only he __________ what I tell him, but he won’t.
①  had done
②  would do
③  would have done
④  has done