[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fwq32JWW4aGQhAzNNb_jyc2oMyiyAsvzPSy17UtUxRx8":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2024-05-07 19:22:35",141927903,[8,9,10,11],"0º~180º","0º~30º","30º~120º","30º~180º",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},8,"48be9ae1428b9f109d80d960cd4f29b3","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F17915e88f96a5217591efb4f8f77efef.png","电力电子技术2024","b7b9ff71c5d6470fbc7d7c9134db1e60","AC-AC变换电路","单相交流调压电路负载阻抗角为30º,控制角的有效移相范围是",[21,32,35,44,53,62,71,80],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],141927902,[25,26,27,28],"改变交流电的频率和控制晶闸管的开通相位","不改变交流电的频率只控制晶闸管的开通相位","只改变交流电的频率而不控制晶闸管的开通相位","以交流电的周期为单位控制晶闸管的通断","交流调压电路是","v1",0,{"answer":33,"createTime":5,"id":6,"options":34,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":36,"createTime":5,"id":37,"options":38,"question":43,"source":30,"type":31},[],141927904,[39,40,41,42],"增加了开关损耗","最低次谐波次数降低","总谐波畸变率变高","增大了输入滤波器体积","斩控式交流调压电路提高斩波频率的不良影响在于",{"answer":45,"createTime":5,"id":46,"options":47,"question":52,"source":30,"type":31},[],141927905,[48,49,50,51],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F9d86e4de770e13131e1d8759a5814b71.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff39e0f5527b8c7a76dd9981ce7bac8ad.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff4899296468d3e66792b3c41d9a56b03.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fc724ea3a70b9d6311784c5581937c0d1.webp\">","单相交流调压电路,电源为工频220V,负载参数为R=0.5Ω,L=2mH,触发角a的移相范围为",{"answer":54,"createTime":5,"id":55,"options":56,"question":61,"source":30,"type":31},[],141927906,[57,58,59,60],"0°","90°","120°","150°","在晶闸管单相交流调压电路构成的调光电路中,负载为白炽灯炮,额定功率为100W,设其阻值恒定,电源电压U为220V.当白炽灯功率需要20W范围运行时,晶闸管的触发角a为",{"answer":63,"createTime":5,"id":64,"options":65,"question":70,"source":30,"type":31},[],141927907,[66,67,68,69],"都只含有\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F7a01714f65710cddc1996f12a4ba81ce.webp\">次谐波","前者含有谐波\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0bf3b10e3b64291ecc10f0c89aad96dd.webp\">,后者因为正负半波对称,则仅含有\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fee4e0604054a0130c83f39b2e7e802be.webp\">次谐波","前者因为没有负半波的畸变,所以仅含有\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fca3fb13d386a79e80abeba6e0cc103cb.webp\">谐波,后者因为正负半波都有畸变,则含有\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03fe83f003023ade978f3495da98c6fd.webp\">次谐波","均包含次\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F54596e6d27942b25e3726b3c90bdd7a8.webp\">谐波","对比纯阻性负载和阻感负载在\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F56ad82a4e2e1ca91fa64241f48f01c2a.webp\">条件下,关于单相交流调压电路输入电流中的谐波情况的描述,正确的是",{"answer":72,"createTime":5,"id":73,"options":74,"question":79,"source":30,"type":31},[],141927908,[75,76,77,78],"负载消耗的功率可以表示为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ffa0e3279f1f95fbc7b39b02c418e34f6.webp\">","可以采用单向交流调压电路","导通周期数目越多,功率因数越高","以电源周期为基准,除了含有整数次谐波之外,还含有非整数倍谐波","对于交流调功电路来说,其工作波形如图所示.下列说法中错误的是\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff06791abeaa1ddb39fb6a30b581bd427.webp\">",{"answer":81,"createTime":5,"id":82,"options":83,"question":88,"source":30,"type":31},[],141927909,[84,85,86,87],"5Hz","10Hz","20Hz","50Hz","电网频率为50Hz时,交-交变频电路的输出上限频率约为"]