【判断题】【消耗次数:1】
三相异步电动机不能自行起动。
正确
错误
参考答案:
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相关题目
【判断题】 三相异步电动机能够自行起动。
①  正确
②  错误
【单选题】 三相异步电动机的起动方法分别为()。
①  直接起动
②  降压起动
③  低频起动
④  以上三项都有
【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
【判断题】 三相异步电动机没有磁场能够运行?
①  正确
②  错误
【简答题】 三相异步电动机的结构是哪些?
【单选题】 三相异步电动机有一个重要特征( )。
①  不能自行起动
②  能自起动
③  自行减速
【单选题】 三相异步电动机全压起动时,电动机的起动电流可达到电动机额定电流的( )倍。
①  10~20
②  4~7
③  24~30
④  一样
【单选题】 三相异步电动机反接制动的优点是( )。
①  制动迅速
②  能耗较小
③  定位准确
④  制动平稳
【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
随机题目
【单选题】 I’ ll be____ the whole factory next week when the director’ s away.
①  charge
②  in the charge of
③  in charge of
④  take charge of
【单选题】 ----Will you please go to see the movie Guanyinshan with me ?----No, I wont. I ______ it already.
①  saw
②  have seen
③  see
④  will see
【单选题】 Things are back to _____ since we paid off all our debts.
①  formal
②  normal
③  regular
④  common
【单选题】 This organization brought Western artists together in the hope of making more of an impact on the art community ____any of them could individually and to promote Western art by women.
①  rather than
②  rather
③  than
④  other than
【单选题】 Gone With The Wind is a ____ movie.
①  remarkable
②  perfect
③  indispensable
④  outstanding
【单选题】 The message is clear: Just as tea and banana can’t go together, ______ should the son of a low class family expect to marry the daughter of a nobleman.
①  either
②  not
③  neither
④  nor
【单选题】 The ____ Court is the highest court in the United States.
①  Superior
②  Super
③  Supreme
④  Great
【单选题】 Peter could hardly catch what I said, _____ he?
①  could
②  couldn’ t
③  did
④  didn’ t
【单选题】 If you don’ t go to his birthday party next Friday,_____.
①  so do I
②  so will I
③  nor do I
④  nor will I
【单选题】 A culture in which the citizens share similar religious beliefs and values is more likely to have laws that represent the wishes of its people than where citizens come from _________ backgrounds.
①  identical
②  dramatic
③  extensive
④  diverse