【判断题】【消耗次数:1】
在直流电机中,电枢的作用是将交流电变为直流电().
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相关题目
【判断题】 直流电源中的整流电路的作用是将直流电压转换为交流电压。
①  正确
②  错误
【单选题】 直流电机换向极作用主要是_________。
①  增加电机气隙磁通
②  改善换向,减少换向时火花
③  没有换向极,就成为交流电机
【单选题】 直流电机换向极作用主要是?
①  A.增加电机气隙磁通
②  B.改善换向,减少换向时火花
③  C.没有换向极,就成为交流电机
④  D.稳定电枢电流
【判断题】 起动机换向器的作用是将交流电变成直流电。()
①  正确
②  错误
【判断题】 直流电机换向极绕组与电枢绕组串联。
①  正确
②  错误
【判断题】 直流电机实质上是一台带有换向器的交流电机。
①  正确
②  错误
【简答题】 将交流电变成直流电的过程称作[填空]
【判断题】 直流电机中电刷的作用是把转动的电枢与外电路相连。
①  正确
②  错误
【判断题】 整流电路的任务是将交流电变成脉动直流电。
①  正确
②  错误
【判断题】 直流电源是将电网电压的交流电转换成直流电的能量转换电路。
①  正确
②  错误
随机题目
【单选题】 When he was a boy,he used to go there and watch________.
①  to repair bicycles
②  bicycles to be repaired
③  bicycles being repaired
④  repairing bicycles
【单选题】 I didnt hear the phone. I________asleep.
①  must be
②  must have been
③  should be
④  should have been
【单选题】 We are confident that relations between ?North Korea and South Korea _______ through further?? efforts to reduce the long-term hostile ?attitudes.
①  are being improved
②  will be ?improved
③  have been improved
④  are improved
【单选题】 Yourroomis______mine.
①  twice as large than
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④  astwicelargeas
【单选题】 The old farmer,________the badly injured and burnt soldier,came out of the burning farmhouse,calling continuously for help.
①  supporting
②  having supported
③  being supported by
④  being supported
【单选题】 They can’t leave until they _______ their work .
①  did
②  are doing
③  have done
④  his done
【单选题】 As I will be away for at least a year,Id appreciate________from you now and then so that I can know how everyone is getting along.
①  having heard
②  to hear
③  hearing
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【单选题】 The dog,________,will be made a good watchdog.
①  to train properly
②  being trained properly
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【单选题】 What ______if I drink this ?
①  happens
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【单选题】 —Have you searched the sitting room for your key? —No. It was in the study________ I remember I left it.
①  which
②  where
③  that
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