【单选题】【消耗次数:1】
三相异步电动机反接制动的优点是( )。
制动迅速
能耗较小
定位准确
制动平稳
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相关题目
【单选题】 三相异步电动机反接制动的优点是()。
①  制动平稳
②  能耗较小
③  制动迅速
④  定位准确
【判断题】 三相异步电动机有回馈制动、反接制动和能耗制动三种制动方式?
①  正确
②  错误
【单选题】 三相异步电动机的制动方式分为直流制动、回馈制动和()。
①  倒拉制动
②  反接制动
【单选题】 三相异步电动机采用能耗制动,切断电源后,应将电动机( )。
①  转子回路串电阻
②  定子绕组两相绕组反接
③  转子绕组进行反接
④  定子绕组送入直流电
【多选题】 三相异步电动机常用的电气制动方法有().
①  A.能耗制动
②  B.反接制动
③  C.电气制动
④  D.电压控制
【单选题】 三相异步电动机反接制动时,采用对称电阻接法,可以限制制动转矩的同时,也限制()。
①  制动电流
②  启动电流
③  制动电压
④  启动电压
【判断题】 三相异步电动机的能耗制动可以按时间原则来控制。
①  正确
②  错误
【判断题】 三相绕线式异步电动机反接制动时机械功率。
①  正确
②  错误
【单选题】 三相异步电动机能耗制动的方法就是在切断三相电源的同时( )。
①  给转子绕组中通入交流电
②  给转子绕组中通入直流电
③  给定子绕组中通入交流电
④  给定子绕组中通入直流电
【判断题】 三相异步电动机的回馈制动是利用发电制动作用起到限制电动机转速的作用。
①  正确
②  错误
随机题目
【单选题】 It is believed lifelong learning is a crucial response to the challenge of the global ________ economy.
①  technology
②  knowledge
③  examination
④  response
【单选题】 —Would you like to come to our party this weekend?—______.
①  Yes, it was an interesting party
②  No, I’d like to
③  I’m sorry that I won’t be able to attend the party
④  No
【单选题】 — Why do you think the distance education cannot take place of the formal education?— I take this opinion __________ my experience.
①  because
②  because of
③  since
④  that
【单选题】 Quizzes are part of the lecture program to keep students engaged and keep them _________, for students to be able to check that they understood what was covered.
①  thinking
②  think a lot
③  to think
④  thought
【单选题】 —Did you enjoy your college life?—______.
①  Yes, it was rich and colorful
②  No, it is interesting
③  I like my college very much
④  yes, it is.
【单选题】 The fact ________ that we are behind the other classes.
①  seems to be
②  must be
③  remains
④  take
【单选题】 By _________ learning possible anytime and anywhere, distance education is a powerful tool for supporting lifelong learning.
①  making
②  make
③  made
④  be made
【单选题】 One big of formal education is the high cost.
①  advantage
②  disadvantage
③  problem
④  condition
【单选题】 No more having to buy expensive textbooks which you will only use for a year or two and then sell or _______ away.
①  get
②  give
③  take
④  gain
【单选题】 Lifelong learning is both formal and non-formal; and the boundaries between face-to-face teaching and ___________ education are increasingly blurred.
①  lifelong
②  formal
③  distance
④  far