【单选题】【消耗次数:1】
一台他励直流发电机的输入功率等于()
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【单选题】 一台他励直流发电机的输入功率P1等于()
①  <imgsrc="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203180904_934.png"alt=""/>
②  <imgsrc="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203180938_647.png"alt=""/>
③  <imgsrc="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203181005_927.png"alt=""/>
【单选题】 一台他励直流发电机的输入功率P1等于()
【单选题】 关于他励直流发电机功率关系说法正确的是:()。
①  <imgwidth="235"height="60"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD12038.png">
②  <imgwidth="215"height="60"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD12148.png">
③  <imgwidth="247"height="60"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD12260.png">
【单选题】 关于他励直流发电机功率关系说法正确的是:()。
【单选题】 并励直流发电机的电磁功率与输出功率之差等于()
①  励磁铜耗和转子铜耗之和
②  铁耗和附加损耗之和
③  +
【单选题】 一台他励直流发电机的输入功率<imgwidth="40"height="59"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD39625.png">等于()
①  <imgwidth="148"height="60"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD39741.png">
②  <imgwidth="157"height="99"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD39862.png">
③  <imgwidth="103"height="60"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD39983.png">
【单选题】 改变他励直流发电机电枢感应电势方向可以改变?
①  原动机转向
②  磁通方向
③  两者其一
④  两者同时改变
【判断题】 一台他励直流发电机,当磁极固定,电刷与电枢同时旋转时,电刷两端的电压是直流电压。
①  正确
②  错误
【判断题】 他励直流发电机的效率一直随着负载电流的增大而增大。
①  正确
②  错误
【单选题】 直流发电机中会不会产生电磁转矩?
① 
②  不会
③  两者都是
④  都不是
随机题目
【单选题】 By the end of last month, she ____ over five hundred letters of congratulation from different parts of the world.
①  would received
②  has received
③  had received
④  receive
【单选题】 Mr. Downham asked the public their views on the two subjects currently ____ discussion.
①  with
②  at
③  to
④  under
【单选题】 People just say it out of politeness and they don’t really ____ it. ?
①  realize ?
②  mean ?
③  think ?
④  regard?
【单选题】 —Don’t forget to come to my birthday party tomorrow.—I ____ .
①  don’t
②  won’t
③  can’t
④  haven’t
【单选题】 Fortunately, Jack was only slightly injured in the traffic ____ .
①  incident
②  event
③  case
④  accident
【单选题】 I want to paint the wall, but I can’t ____ on the color. ?
①  design ?
②  decide ?
③  desire ?
④  detect?
【单选题】 The book I ____ the other day can be found nowhere.
①  borrow
②  borrowed
③  are borrowing
④  was borrowing
【单选题】 Her parents objected to ____ that farmer, though he has a lot of money.?
①  her marrying ?
②  marrying ?
③  marry ?
④  her marrying with?
【单选题】 Tom, what did you do with my documents? I have never seen such a____ and disorder!
①  mass
②  mess
③  guess
④  bus
【单选题】 —Could I borrow your dictionary? —I’d get it for you ____I could remember who last borrowed it.
①  except that
②  unless
③  only if
④  if only