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【单选题】
对于二次回路的标号,按线的性质用途进行编号叫___。
A. 相对编号法
B. 绝对编号法
C. 回路编号法
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答案
C
解析
暂无解析
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流过导体单位截面积的电流叫电流密度,其单位为___。
A. 安培
B. 安培/平方米
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临时遮栏设置在可能发生人体接近带电体的巡视通道和检修设备的周围。___
A. 对
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对于接线方式较为简单的小容量变电所,操作电源常常采用___。
A. 直流操作电源
B. 交流操作电源
C. 逆变操作电源
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电对人体的伤害,主要来自___。
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作为电气工作者,员工必须熟知本工种的()和施工现场的安全生产制度,不违章作业。___
A. 生产安排
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电气设备有三种工作状态,即运行备用___。
A. 冷备用
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单选题电压质量包含()电压允许波动与闪变三相电压允许不平衡度等内容。___
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B. 电压允许偏差
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判断题电气设备发生火灾时,严禁使用能导电的灭火剂进行带电灭火。___
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单选题用型万用表的档测量/的电压互感器二次绕组电压时,指针盘摆度约为满刻度的/,由此可知此高压设备电压约为___。
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【单选题】
单选题交流高压真空接触器适用于交流系统中___的场合。
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判断题因真空断路器的触头设置在真空灭弧室内,所以对触头材料的含气量高低没有要求。___
A. 对
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【单选题】
6.单选题电气设备有三种工作状态,即运行___检修状态。
A. 热备用
B. 备用
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判断题倒闸操作每一项操作结束后,操作人应认真检查被操作的设备状态,被操作的设备状态应与操作项目的要求相符合,并处于良好状态。___
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判断题在防雷装置中用以接受雷云放电的金属导体称为接闪器。___
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判断题电力线路的作用是输送和分配电能。___
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判断题由于检修工作需要,可将六氟化硫()断路器打开后,将六氟化硫()气体排入大气中。___
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【单选题】
判断题操作票中,一项操作任务需要书写多页时,须注明转接页号,且页号相连。___
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判断题电力系统过电压分成两大类:外部过电压和内部过电压。___
A. 对
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【单选题】
判断题导体处于变化的磁场中时,导体内会产生感应电动势。___
A. 对
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判断题电弧电流的本质是离子导电。___
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判断题变压器是根据电磁感应原理工作的。11.判断题操作票中,一项操作任务需要书写多页时,须注明转接页号,且页号相连。___
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判断题真空灭弧室中的动静触头断开过程中,产生电弧的主要因素是依靠触头产生的金属蒸气使触头间产生电弧。___
A. 对
B. 错
【单选题】
单选题继电保护的()是指保护快速切除故障的性能。___
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判断题在电路中,电能的单位常用单位是?,并且,?的电能俗称为度电。___
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【单选题】
单选题验电时应在检修设备___各相分别验电。
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判断题在室内高压设备上工作,应在工作地点两旁及对面运行设备间隔的遮栏(围栏)上和禁止通行的过道遮栏(围栏)上悬挂“止步,高压危险!”的标示牌。___
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判断题在电路中,将两个及以上的电阻,一个接一个的顺序联接起来,称为电阻的串联。___
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判断题电能质量包括电流频率和波形的质量。___
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判断题当人体同时接触带电设备或线路中的两相导体时,电流从一相导体经人体流入另一相导体,构成闭合回路的触电事故称为两相触电。___
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判断题部分停电的工作,安全距离小于规定距离以内的未停电设备,应装设临时遮栏。___
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判断题二次线圈有无开路,接地线是否良好,有无松动和断裂现象,是电流互感器巡视检查项目之一。___
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判断题电流互感器运行前检查外壳及二次侧应接地正确良好,接地线连接应坚固可靠。___
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判断题新安装或大修后的断路器,投入运行前必须验收合格才能施加运行电压。___
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单选题从区域变电所到用户变电所或城乡电力变压器之间的线路,是用于分配电能的,称为___。
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【单选题】
判断题在电阻串联的电路中,电路的总功率等于各串联电阻的功率之和。___
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单选题运行过程中易发生过负荷和需要防止起动或自起动时间过长的电动机应装设___。
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【单选题】
单选题消弧线圈实际是一个铁芯线圈,其___很小,电抗很大。
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