[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fhkhJNpzLapvGYtmBuQcUf-DpLuZZ-Q3TeG7-2Tfyy6A":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":16,"related":17,"source":28,"type":61},[],"2023-10-12 17:07:35",99261551,[8,9,10,11],"反馈制动","反接制动","能耗制动","以上都不是",{"courseId":13,"courseImg":14,"courseName":15},"70c4f46004b45a008c55238b84408919","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa88548c67a838814120765ff5a0261db.jpg","机电传动控制","属于他励直流电动机的制动方法是",[18,30,39,44,53,62,65,74,83,89],{"answer":19,"createTime":20,"id":21,"options":22,"question":27,"source":28,"type":29},[],"2023-10-12 17:07:34",99261544,[23,24,25,26],"调压调速","串电阻调速","弱磁调速","A和B","_________的调速方式可以实现对恒转矩型负载的无极调速","v1",0,{"answer":31,"createTime":20,"id":32,"options":33,"question":38,"source":28,"type":29},[],99261545,[34,35,36,37],"Ke","Φ","Ia","U","直流电动机调速系统,若想采用恒功率调速,则可改变_________",{"answer":40,"createTime":5,"id":41,"options":42,"question":43,"source":28,"type":29},[],99261546,[34,35,36,37],"直流电动机调速系统,若想采用恒转矩调速,则可改变_________",{"answer":45,"createTime":5,"id":46,"options":47,"question":52,"source":28,"type":29},[],99261547,[48,49,50,51],"只能在n0以下无级调速","机械特性变硬,调速范围不大","轻载时产生飞车事故","都不对","直流他励电动机的调速特性,改变主磁通φ,下列说法正确的是",{"answer":54,"createTime":5,"id":55,"options":56,"question":60,"source":28,"type":61},[],99261549,[57,58,59,11],"改变电枢电路串接电阻","改变电动机电枢供电电压","改变电动机主磁通","下列属于他励直流电动机调速方法的是",1,{"answer":63,"createTime":5,"id":6,"options":64,"question":16,"source":28,"type":61},[],[8,9,10,11],{"answer":66,"createTime":5,"id":67,"options":68,"question":73,"source":28,"type":61},[],99261553,[69,70,71,72],"机械特性变软,稳定性差","轻载时调速范围不大","无级调速困难;电阻上消耗大量电能","启动电阻不能用来调速","他励直流电动机电枢电路外串电阻调速,正确的是",{"answer":75,"createTime":5,"id":76,"options":77,"question":82,"source":28,"type":61},[],99261557,[78,79,80,81],"连续平滑调速,在nN以下调速","机械特性硬度不变","调速时电流不变,转矩不变,恒转矩调速","利用降压启动电机而不用其他设备","他励直流电动机改变电压调速有以下特点",{"answer":84,"createTime":5,"id":85,"options":86,"question":87,"source":28,"type":88},[],99261561,[],"电压与欠电压保护和弱励磁保护.他励直流电动机的工作状态,电动机发出的T和n方向相同 ,(填写 电动状态,发电状态)",2,{"answer":90,"createTime":5,"id":91,"options":92,"question":95,"source":28,"type":96},[],99261563,[93,94],"正确","错误","电动机的调速即由于电动机负载转矩发生变化(增大或减小),而引起的电动机转速变化(下降或上升)",3]