【判断题】【消耗次数:1】
闸刀开关可以用于分断堵转的电动机。
正确
错误
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相关题目
【判断题】 闸刀开关可以用于分断大容量的电动机。
①  正确
②  错误
【判断题】 电动机将在缺相情况下会低速运转或堵转,定子电流很大,这时应对其进行断相保护。
①  正确
②  错误
【判断题】 开关磁阻电动机是由磁阻式电动机和开关电源组成机电一体化新型调速电动机?
①  正确
②  错误
【判断题】 电动机正常运行时,负载的转矩不得超过最大转矩,否则将出现堵转现象。
①  正确
②  错误
【判断题】 绕线式异步电动机转子回路串电阻可以增加堵转转矩?
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【单选题】 电动机将在缺相情况下会低速运转或堵转,定子电流很大,这时应对其进行( )保护。
①  欠电压保护
②  缺相保护
③  过电流保护
④  失电压保护
【单选题】 交流主轴电动机可称为()电动机。
①  三相异步电动机
②  三相同步电动机
③  交流永磁同步电动机
④  以上选项都不对
【单选题】 可用于开环伺服控制的电动机是()
①  交流主轴电动机
②  永磁宽调速直流电动机.
③  无刷直流电动机
④  功率步进电动机
【单选题】 可用于开环伺服控制的电动机是()
①  交流主轴电动机
②  永磁宽调速直流电动机
③  无刷直流电动机
④  功率步进电动机
【单选题】 刀开关适用于照明、电热设备及小容量电动机控制电路中。
① 
② 
随机题目
【单选题】 The man told me that by the end of the week he _______ away from his hometown for 20 years.
①  has been
②  will have been
③  is to be
④  would have been
【单选题】 Although he did not know London well, he made his way ______ to the airport.
①  easy enough
②  enough
③  easily enough
④  enough easily
【单选题】 The world is trying every means to _____the friendship between the two countries.
①  raise
②  promote
③  arise
④  protest
【单选题】 One rainy night the policeman had a chance _____ with a gang of smugglers.
①  acquaintance
②  encounter
③  account
④  interview
【单选题】 Let’s make it round 9 o’clock.____________
①  No. I think so.
②  I am proud of you!
③  It’s impossible.
④  Would some time later be convenient?
【单选题】 After driving for thirty miles, she suddenly realized that she ()in the wrong direction.
①  was driving
②  has been driving
③  had been driving
④  drove
【单选题】 I am not sure whether I can gain any profit from the investment, so I can’t make a(n) ____ tohelp you.
①  exact
②  defined
③  definite
④  sure
【单选题】 It was a(n) _______ achievement ― no one has ever won the championship five times before.
①  single
②  unique
③  only
④  sole
【单选题】 There are many children()behaviour is generally unacceptable.
①  who
②  whom
③  whose
④  that
【单选题】 Happy New Year to you. ____________
①  The same to you.
②  Yes, I am happy.
③  What about you.
④  Very well, thanks.