【判断题】【消耗次数:1】
三相异步电动机的同步转速和转轴速度一样?
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错误
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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
【判断题】 三相异步电动机的转子回路串电阻并不改变同步转速。
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】 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
【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】 三相异步电动机转子的转速低于旋转磁场的转速。
①  正确
②  错误
【判断题】 三相异步电动机不能自行起动。
①  正确
②  错误
【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
【多选题】 三相异步电动机的基本结构?
①  定子
②  转子
③  附件
【单选题】 三相异步电动机的转向取决于( )。
①  初始转向
②  电源相序
③  电源电压
④  电动机本身
随机题目
【单选题】 Never in my wildest dreams ____ lead to a career in the NBA, which has allowed me to give back to my people in Africa.
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①  comeround
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①  turned
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【单选题】 ——May I put my luggage on the seat beside you, sir? ——____.
①  Sure,withpleasure
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【单选题】 03. I promised to look_________ the matter as soon as I got there.
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【单选题】 10. After a three-hour heated discussion, all the members in the jury reached the conclusions that the man was_________ of murder.
①  criminal
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【单选题】 09. The chemical factory was demolished _________ protecting the environment.
①  inspiteof
②  inhonorof
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【单选题】 06. He spoke so quickly that I didn t _________ what he said.
①  makefor
②  makesure
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【单选题】 01. You should be able to_________ right from wrong.
①  perceive
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③  sight
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