【判断题】【消耗次数:1】
电力系统中最常见最危险的故障是单相接地故障。
正确
错误
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相关题目
【判断题】 单相接地短路为故障相与大地之间的故障环路。
①  正确
②  错误
【单选题】 电力系统的复杂故障是指()。
①  横向故障
②  纵向故障
③  电力系统中不同地点同时发生不对称故障
【单选题】 电力系统中发生概率最多的短路故障是()
①  三相短路
②  两相短路
③  两相短路接地
④  单相接地短路
【单选题】 单相接地保护是利用系统发生单相接地时所产生的零序电流来实现的。
①  正确
②  错误
【单选题】 中性点不接地系统中发生单相接地时,接地点有电流流过,电流的通路是()
①  变压器、输电线
②  发电机
③  输电线、中性点
④  输电线路和线路对地电容
【判断题】 建筑供电系统属于电源中性点不接地的电力系统
①  正确
②  错误
【单选题】 对称短路是电力系统中( )短路。
①  单相
②  二相
③  三相
④  两极接地
【单选题】 电力系统的稳定性是指( )。
①  系统无故障时间长短
②  两电网并列运行能力
③  系统抗干扰的能力
④  系统中电气设备利用率
【多选题】 电力系统的主体结构分为()。
①  电源
②  水电站
③  电力网
④  负荷中心
【单选题】 系统发生两相接地短路故障时,复合序网的连接方式为(  )
①  正序、负序、零序并联
②  正序、负序并联、零序网开路
③  正序、零序并联、负序开路
④  零序、负序并联,正序开路
随机题目
【单选题】 The thieves _____the waste paper all over the room while they were searching for the diamond ring.
①  spread
②  scratched
③  scattered
④  burned
【单选题】 They _____ our house at $10.000.
①  count
②  vanish
③  weave
④  assess
【单选题】 George was introduced to _____activities at a young age, when she was hired to act as a lookout for drug-dealers.
①  illegal
②  lawful
③  faithful
④  peaceful
【单选题】 When he studied at college, Jack was supported by a _____ .
①  treatment
②  assistance
③  scholarship
④  protein
【单选题】 When I read the newspaper, I always read the _____ first.
①  headlines
②  headquarters
③  heaven
④  horizon
【单选题】 The millions of circulations involved, _____ by hand, would have lost all practical value by the time they were finished.
①  had they been done
②  they had been done
③  having been done
④  they were done
【单选题】 Betty advised me to label our luggage carefully in case it gets _____ in transit.
①  misused
②  mishandled
③  mistaken
④  mislaid
【单选题】 It was dark in the cave so she _____a match.
①  struck
②  hit
③  fired
④  burned
【单选题】 Jack is so _____ to his appearance that he never has his clothes pressed.
①  adverse
②  anonymous
③  indifferent
④  casual
【单选题】 When he was asked about the missing briefcase, the man _____ever seeing it.
①  refused
②  denied
③  opposed
④  resisted