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编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第PAGE7页共NUMPAGES7页第PAGE\*MERGEFORMAT7页共NUMPAGES\*MERGEFORMAT7页单选题（共10道试题，共50分。）HYPERLINK"http://learn.open.com.cn/StudentCenter/OnLineJob/DoHomework.aspx?CourseExerciseID=89493&key=25c74e6ef32b532f"\l"#"V1.已知单相交流电路中某负载视在功率为5kVA，有功功率为4kW，则其无功功率Q为（）。HTMLCONTROLForms.HTML:Option.1A.1kVarHTMLCONTROLForms.HTML:Option.1B.3kVarHTMLCONTROLForms.HTML:Option.1C.9kVarHTMLCONTROLForms.HTML:Option.1D.0kVar满分：5分2.题目和答案如下图所示：HTMLCONTROLForms.HTML:Option.1A.HTMLCONTROLForms.HTML:Option.1B.HTMLCONTROLForms.HTML:Option.1C.HTMLCONTROLForms.HTML:Option.1D.满分：5分3.题目和答案如下图所示：HTMLCONTROLForms.HTML:Option.1A.HTMLCONTROLForms.HTML:Option.1B.HTMLCONTROLForms.HTML:Option.1C.HTMLCONTROLForms.HTML:Option.1D.满分：5分4.一个输出电压几乎不变的设备，有载运行。当负载增加时，是指（）。HTMLCONTROLForms.HTML:Option.1A.负载电阻越来越大HTMLCONTROLForms.HTML:Option.1B.负载电流越来越小HTMLCONTROLForms.HTML:Option.1C.电源输出电流越来越大满分：5分5.理想电压源和理想电流源间（）。HTMLCONTROLForms.HTML:Option.1A.有等效变换关系HTMLCONTROLForms.HTML:Option.1B.没有等效变换关系HTMLCONTROLForms.HTML:Option.1C.有条件下的等效关系满分：5分6.某电源向一可变电阻RL供电，当负载电阻RL从100W减至10W，负载电压U约下降1％。该电源是（）。RLHTMLCONTROLForms.HTML:Option.1A.理想电压源HTMLCONTROLForms.HTML:Option.1B.理想电流源HTMLCONTROLForms.HTML:Option.1C.电压源，内阻R0=0．1W满分：5分7.题目和答案如下图所示：HTMLCONTROLForms.HTML:Option.1A.HTMLCONTROLForms.HTML:Option.1B.HTMLCONTROLForms.HTML:Option.1C.HTMLCONTROLForms.HTML:Option.1D.满分：5分8.题目和答案如下图所示：HTMLCONTROLForms.HTML:Option.1A.HTMLCONTROLForms.HTML:Option.1B.HTMLCONTROLForms.HTML:Option.1C.HTMLCONTROLForms.HTML:Option.1D.满分：5分9.题目和答案如下图所示：HTMLCONTROLForms.HTML:Option.1A.HTMLCONTROLForms.HTML:Option.1B.HTMLCONTROLForms.HTML:Option.1C.HTMLCONTROLForms.HTML:Option.1D.满分：5分10.题目和答案如下图所示：HTMLCONTROLForms.HTML:Option.1A.HTMLCONTROLForms.HTML:Option.1B.HTMLCONTROLForms.HTML:Option.1C.HTMLCONTROLForms.HTML:Option.1D.满分：5分判断题（共10道试题，共50分。）
