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【判断题】
降低功率因数标准的用户的实际功率因数,高于或低于降低后的功率因数标准时,都应减收或增收电费
A. 对
B. 错
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答案
B
解析
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变压器做空载试验时,应在额定电压下进行
A. 对
B. 错
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若穿过每匝线圈的磁通量相同,则该线圈的磁链与其匝数N成反比,与穿过的磁通量成正比
A. 对
B. 错
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磁场的强弱使用磁感强度(也叫磁感应强度)来表示,磁感强度大表示磁感强;磁感强度小,表示磁感弱
A. 对
B. 错
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视在功率就是电路中电压有效值U和电流有效值I以及功率因素的乘积
A. 对
B. 错
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所有的巡视工作必须按照规定的巡视周期进行
A. 对
B. 错
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减少降压变压器二次绕组的匝数,可提高二次侧的输出电压
A. 对
B. 错
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金具组装配合应良好,安装前应进行外观检查
A. 对
B. 错
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全站停电时,应先拉开电容器组断路器后,再拉开各路出线断路器
A. 对
B. 错
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立杆时侧拉绳可取电杆高度的1.2~1.5倍
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电压互感器和电流互感器的工作原理与电力变压器工作原理基本相同
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B. 错
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居民用户一般使用的是2.0级电能表
A. 对
B. 错
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开启式负荷刀开关的熔丝只有在过负荷时熔断,而短路故障时不熔断
A. 对
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钢管配线时,管身及接线盒需连接成为一个不断的导体,并接地
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用电检查现场发现:某客户私自将电能表的封印拆除,将A相电流进出线反接,其行为是窃电
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B. 错
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在电路计算时,先假定电流参考方向,计算结果为正说明电流实际方向与参考方向相同;反之,计算结果为负说明实际方向与参考方向相反
A. 对
B. 错
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最大值是指正弦交流电压或电流在变化过程中出现的最大瞬时值
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在兆欧表没有停止转动或被测设备没有放电之前,切勿用手去触及被测设备或兆欧表的接线柱
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配电网运行分析周期为每季度一次
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B. 错
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拉线盘只有混凝土拉线盘
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电能表总线应为铜线,中间不得有接头
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5mm2塑料绝缘铜线的允许载流量为32A
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配电箱主要用于进行配电的控制、保护、计量、分配和监视等
A. 对
B. 错
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使用电烙铁时,应防止电源线搭在发热部位上,以免损伤导线绝缘层发生漏电
A. 对
B. 错
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用一个恒定电动势E和一个内阻Ro串联组合来表示一个电源,用这种方式表示的电源称为电压源
A. 对
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位移正杆可在线路带电情况下进行
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B. 错
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柴油发电机组安装地的周围应保持清洁,避免在附近放置能产生酸性、碱性等腐蚀性气体和蒸汽的物品。有条件的应配置灭火装置
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B. 错
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由于铁心需要接地,因此铁心垫脚绝缘损坏对变压器运行无影响
A. 对
B. 错
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变压器油箱密封处渗漏,可能是由于螺丝松紧不均匀或螺丝太松
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在电缆头制作前,首先应校直电缆
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【单选题】
在___时间内电流所做的功叫做电功率。P8T40
A. 规定
B. 标称
C. 单位
【单选题】
对单匝线圈来说,其产生的磁通与流过线圈电流的比值叫该线圈的___,也叫电感,用L表示。P11T54
A. 自感系数
B. 磁通
C. 电流
【单选题】
电器的触头系统属于电器的___P15T82。
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【单选题】
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【单选题】
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A. 并励发电机
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C. 串励发电机
【单选题】
由两以上匝数不同的线圈绕在一个构成闭合回路的铁心上组成的电气装置是___P19T100 。
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