问题:下列行业中,用电负荷波动比较大,容易造成电压波动,产生谐波和负序...
Tuesday, September 13, 2022
Sunday, September 11, 2022
问题:停电测试高压电压、电流互感器变比时,施加的电压不应低于被试电压互...
Sunday, September 11, 2022
问题:以下哪项原因不是造成集中器GPRS无法上线的原因()...
Sunday, September 11, 2022
Sunday, September 11, 2022
问题:对于电压二次回路连接导线截面应按允许的电压降计算确定。至少应不小于()。A、6mm2B、4mm2C、3mm2D、2.5mm2...
Tuesday, July 4, 2023
Sunday, September 11, 2022
问题:一只220V60W的灯泡,把它改接到110V的电源上,消耗功率为...
Tuesday, September 13, 2022
Sunday, September 11, 2022
问题:某线路导线电阻为2Ω,电抗为4Ω,终端接有功负荷为200kW,功...
Sunday, September 11, 2022
问题:搭接导线前。应将每相线头绝缘层削掉。绝缘切削长度满足搭线要求,如...
Tuesday, September 13, 2022
Sunday, September 11, 2022
问题:某电焊机的额定功率为10kW,铭牌暂载率为25%,则其设备计算容...
Sunday, September 11, 2022
问题:两只单相电压互感器V/V接法,测得Uab=Uac=100V,Ub...
Tuesday, September 13, 2022
问题:两只额定电压为220V的白炽灯泡,一个是100W,一个是40W。...
Sunday, September 11, 2022
Sunday, September 11, 2022
Sunday, September 11, 2022
问题:在交流电路中,当电流落后于电源电压一个小于90°角相位时,则为(...
Sunday, September 11, 2022
问题:国家电网公司是中央直属的国有独资企业,所有者是(),法律规定由国...
Sunday, September 11, 2022