【判断题】【消耗次数:1】
变压器的电压变化率与变压器的短路阻抗大小有关。
正确
错误
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相关题目
【判断题】 额定电压为的单相变压器,短路阻抗,负载阻抗为,从一次侧看进去总阻抗大小为。
①  正确
②  错误
【单选题】 当变压器的电压比大于1 时,变压器为( )。
①  升压变压器
②  加压变压器
③  降压变压器
【判断题】 变压器短路试验是通过测量短路电流、短路电压及短路功率来计算变压器的短路电压百分数、铜损和短路阻抗吗?
①  正确
②  错误
【单选题】 并联运行时,变压器短路阻抗越小,则该变压器流过的电流()。
①  越小
②  越大
③  不变
【判断题】 变压器并联运行时,短路阻抗标幺值小的变压器先达到满载吗?
①  正确
②  错误
【单选题】 变压器的短路损耗_____。
①  全部为铜耗;?
②  全部为铁耗;?
③  主要为铜耗。
【单选题】 一台单相变压器,原边阻抗和折算后的付边阻抗相等,若此变压器在额定电压下短路? (指稳态短路),此时铁芯中的磁通_____。
①  减少到近似原来磁通的1/2;?
②  略微减少一点;?
③  略微增加一点。
【单选题】 变压器副边额定电压是变压器原边加额定电压,副边()
①  空载相电压
②  空载线电压
③  额定负载相电压
④  额定负载线电压
【判断题】 变压器能变电压也可以变电流、变阻抗。
①  正确
②  错误
【单选题】 变压器二额定电压是( )。
①  一次有额定电流时的电压
②  一次有额定电压,二次空载时的电压
③  一次有额定电压,二次有额定负载的电压
④  二次额定负载下的电压
随机题目
【单选题】 10. Luckily, the house ______ the storm.
①  lived
②  . survived by
③  survived
④  was survived by
【单选题】 1. The authors purpose of writing
①  To describe a planes jolt
②  To tell the readers a story about the lightning.
③  To narrate the authors personal experience during an accident.
【单选题】 12.Most _______residents tried to seek protection in the local hospitals.
①  paniced
②  panicked
③  panic
④  panicking
【单选题】 3.My grandma is ______ good health.
①  blessed with
②  blessed about
③  blessing with
④  blessing out
【单选题】 22.The sight of the fruit salad made our daughter Kit’s mouth ____.
①  wet
②  water
③  soak
④  taste
【单选题】 20. He talks as if he _____the manager here.
①  were
②  is
③  will be
④  has been
【单选题】 14. A: The box is heavy. B:I _______carry it for you.
①  will
②  am going to
③  may
④  . must
【单选题】 16. A; John , do you want me to take you to the hospital? B: No, thanks. Ann _____ take me.
①  will
②  is going to
③  may
④  must
【单选题】 13.I ______to a party tomorrow. Would you like to come too?
①  will go
②  am going
③  might go
④  can go
【单选题】 6.All this is highly ______ for those who worried a year ago that the country would have difficulty rebuilding its economy.
①  recalling
②  reassuring
③  reminding
④  removing