[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fFoHiBai3FTmXsJyiRLl6VJXojcA1pq8WfMv-c1vWWvE":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":16,"related":17,"source":23,"type":49},[],"2024-01-01 22:52:31",125317147,[8,9,10,11],"不等于","大于","等于","小于",{"courseId":13,"courseImg":14,"courseName":15},"42c7cbe8f60c93230941905b2c236d2c","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe07d935b34d7a116e255e816d8b8f5c7.jpg","电工技术","小刘将三相发电机的负载采取三角形连接,然后用万用表测量线电压和相电压,测量出的结果是线电压( )相电压",[18,25,30,35,40,46,50,60,69,78],{"answer":19,"createTime":5,"id":20,"options":21,"question":22,"source":23,"type":24},[],125317126,[],"负载作星形联接,已知RU=RV=10Ω,RW=20Ω,电源线电压为380V,试问:1、各相电流和中线电流各为多少?2、如果U相断开,中性线不断开,各相电流各为多少?3、如果U相断开,并且中线也断开了,各相负载两端的电压是多少?各相电流是多少?V相和W相能否正常工作","v1",7,{"answer":26,"createTime":5,"id":27,"options":28,"question":29,"source":23,"type":24},[],125317129,[],"有一三相对称负载,每相负载的R=8Ω,XL=6Ω,电源电压为380 V.求负载接成星形时的线电流、相电流和有功功率",{"answer":31,"createTime":5,"id":32,"options":33,"question":34,"source":23,"type":24},[],125317132,[],"三相对称负载星形连接于UL=380V的对称三相电源上,其线电流IL=2.2A,cosφ=0.8,试求电路的总功率",{"answer":36,"createTime":5,"id":37,"options":38,"question":39,"source":23,"type":24},[],125317138,[],"现有120只220V,100W的白炽灯泡,怎样将其接入线电压为380V的三相四线制供电线路最为合理?按照这种接法,在全部灯泡点亮的情况下,线电流和中线电流各是多少",{"answer":41,"createTime":5,"id":42,"options":43,"question":44,"source":23,"type":45},[],125317142,[],"某大楼电灯发生故障,第二层楼和第三层楼所有电灯都突然暗下来,而第一层楼电灯亮度不变,试问这是什么原因?这楼的电灯是如何联接的?同时发现,第三层楼的电灯比第二层楼的电灯还暗些,这又是什么原因",4,{"answer":47,"createTime":5,"id":6,"options":48,"question":16,"source":23,"type":49},[],[8,9,10,11],0,{"answer":51,"createTime":52,"id":53,"options":54,"question":59,"source":23,"type":49},[],"2024-01-01 22:52:32",125317150,[55,56,57,58],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F4907182de9e802fa6ed1e949f2299d99.webp\">","1","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0bb6e3a9016f9e495ee59960d7d7fc8a.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F095fcc10479cf84b11a2ac9812d8a982.webp\">","三相对称负载星形连接时,线电压有效值是相电压有效值的 倍",{"answer":61,"createTime":52,"id":62,"options":63,"question":68,"source":23,"type":49},[],125317153,[64,65,66,67],"星形连接","三角形连接","星形连接必须接中性线","星形、三角形连接均可","某三相电动机,其每相绕组的额定电压为380V,电源电压为220V,电源绕组为星形连接,则电动机应作 ( )",{"answer":70,"createTime":52,"id":71,"options":72,"question":77,"source":23,"type":49},[],125317155,[73,74,75,76],"120","240","180","360","对称三相电源各相电压互差 度",{"answer":79,"createTime":52,"id":80,"options":81,"question":85,"source":23,"type":49},[],125317162,[82,83,84],"1211","二氧化碳","泡沫","不能用于带电灭火的灭火器是 灭火器"]