【单选题】【消耗次数:1】
一台三相6极电动机,每极每相槽数q=3,则定子总槽数Z1和极距分别为()
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【单选题】 一台三相6极电动机,每极每相槽数q=3,则定子总槽数Z1和极距<imgsrc="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203180440_306.png"alt=""/>分别为()
①  <imgsrc="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203181207_212.png"alt=""/>
②  <imgsrc="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203181245_909.png"alt=""/>
③  <imgsrc="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203180627_185.png"alt=""/>
【单选题】 一台三相6极电动机,每极每相槽数q=3,则定子总槽数Z1和极距<imgwidth="35"height="38"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD38712.png">分别为()
①  <imgwidth="328"height="59"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD38829.png">
②  <imgwidth="328"height="59"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD38940.png">
③  <imgwidth="328"height="59"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD39052.png">
【单选题】 一台三相四极异步电动机,额定转差率是 0.04,若电源频率是50Hz,则电动机的转速为( )。
①  1440r/min
②  1450r/min
③  1000r/min
【判断题】 通常三相笼型异步电动机定子绕组和转子绕组的相数不相等,而三相绕线转子异步电动机的定、转子相数则相等.( )
①  正确
②  错误
【单选题】 一台三相异步电动机的转速为720 r/min,应选择电动机的磁极数为
①  八极
②  六极
③  四极
【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
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④  以上三项都有
【判断题】 一台6极三相异步电动机接于50Hz的电源上,转速为960r/min。此时电 动机的转子电流频率为2Hz。
①  正确
②  错误
【单选题】 在三相交流异步电动机的定子上布置有( )的三相绕组。
①  结构相同,空间位置互差90°电角度
②  结构相同,空间位置互差120°电角度
③  结构不同,空间位置互差180°电角度
④  结构不同,空间位置互差120°电角度
【多选题】 三相四极漏电开关具有()保护功能。
①  A.短路保护功能
②  B.漏电保护功能
③  C.过载保护功能
④  D.欠压失压保护功能
【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
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【单选题】 James plans to __________ offers from other companies before making a decision.
①  explode
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①  bring up
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①  how
②  who
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①  Well, no, you’re going in the wrong direction
②  No, don’t ask me
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④  completed
【单选题】 Between 1974 and 1997, the number of overseas vistors expanded_______27%.
①  by
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①  Either;or
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③  So; that
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①  started
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