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常用的辅助安全用具有绝缘手套、绝缘靴、绝缘垫、绝缘棒等。 ()
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断电灭火紧急切断低压导线时应三相同时剪断。 ()
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发生两相触电危害比单相触电更严重。 ()
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当梯子的高度大于 6m 时,要上、中、下三端绑扎。
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重复接地的接地电阻要求小于 4Ω。()
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临时接地线的连接要使用专用的线夹固定 ,其接地端通常采用绑扎连接 ,各连接点必须要牢固。
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装设剩余电流动作保护器虽然是一种很有效的触电防护措施 ,但不能作为单独的直接接触触电的防护手段。 ()
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基本安全用具是指那些主要用来进一步加强基本安全用具绝缘强度的工具。 ()
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接地系统的单相触电比不接地系统的单相触电危险性大。 ()
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移动电气设备的电源线单相用三芯电缆 ,三相用四芯电缆。
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防止人身触电的技术措施有保护接地和保护接零、 采用安全电压、 装设剩余电流保护器等。 ()
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低压电笔的测量范围为 500V 以下。
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合理的规章制度是保障安全生产的有效措施 ,工矿企业等单位有条件的应该建立适合自已情况的安全生产规章制度。
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在高压带电设备上 ,辅助安全工具可作为基本安全用具使用。 ()
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使人体能够感觉 ,但不遭受伤害的电流称为摆脱电流。 ()
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接触电压是指人站在带电外壳旁 (水平方向 0.8m 处),人手触及带电外壳时 ,其手、脚之间承受的电位差。 ()
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配电装置的长度超过 6m 时,屏后应有两个通向本室或其他房间的出口 ,其距离不宜大于 20m 。
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人体与带电体的直接接触触电可分为跨步电压触电、接触电压触电。 ()
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电工作业人员应根据实际情况遵守有关安全法规 ,规程和制度。
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运行中的电压互感器内部有放电声及其他噪声 ,线圈与外壳之间或引线与外壳之间有火花放电现象 ,应立即退出运行。 ()
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变压器并列运行 ,一般允许阻抗电压有± 10%的差值 ,若差值大 ,可能阻抗电压大的变压器承受负荷偏高 ,阻抗电压小的变压器承受负荷偏低 ,从而影响变压器的经济运行。 ()
【判断题】
瓷套管是否清洁 ,有无缺损、 裂纹和放电现象 ,声音是否正常 ,是电流互感器巡视检查项目之一。 ()
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按照国家标准 ,铭牌上除标出变压器名称、型号、产品代号、标准代号、制造厂名、出厂序号、制造年月以外 ,还需标出变压器的技术参数数据。 ()
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在使用变压器时 ,要注意绕组的正确连接方式 ,否则变压器不仅不能正常工作 ,甚至会烧坏变压器。 ()
【判断题】
变压器一、二次侧绕组因匝数不同将导致一、二次侧绕组的电压高低不等 ,匝数多的一边电压低 ,匝数少的一边电压高 ,这就是变压器能够改变电压的道理。 ()
【判断题】
变压器额定容量的大小与电压等级也是密切相关的 ,电压低的容量较大 ,电压高的容量较小。 ()
【判断题】
当变压器的温度达到稳定时的温升时称为稳定温升。 ()
【判断题】
充油电流互感器运行前应检查外观清洁 ,油量充足 ,无渗漏油现象。 ()
【判断题】
变压器运行巡视应检查变压器上层油温 ,正常时一般应在 95℃以下 ,
【判断题】
当两台同型号的电压互感器接成 V 形时 ,必须注意极性正确 ,否则会导致互感器线圈烧坏。 ()
【判断题】
S11-160/10 表示三相油浸自冷式 ,双绕组无励磁调压 ,额定容量 160kVA,低压侧绕组额定电压为 10kV 电力变压器。 ()
【判断题】
变压器一、二次电流之比与一、二次绕组的匝数比成正比。 ()
【判断题】
电压互感器二次绕组、铁芯和外壳都必须可靠接地 ,在绕组绝缘损坏时 ,二次绕组
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电压调整率的定义为 ,在给定负载功率因数下 (一般取 0.8)二次空载电压 U2N 和二次负电压 U2 之和与二次额定电压 U2N 的比。 ()
【判断题】
二次侧额定电压 U2N 指的是分接开关放在额定电压位置 ,一次侧加额定电压时 ,二次侧短路的电压值。 ()
【判断题】
变压器内部的高、低压引线是经绝缘套管引到油箱外部的 ,它起着固定引线和
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电流互感器一次侧带电时 ,允许二次线圈开路 ,在二次回路中允许装设熔断器或隔离开关。 ()
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所谓额定容量指 :在变压器铭牌所规定的额定状态下 ,变压器二次侧的输出能力 (kVA)。
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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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单线制的零线截面 ,应与相线截面相同。 ()
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A. You do not have to.
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C. We will send another tomorrow.
D. Nothing serious.
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--Will you please give the note to him? _________.
A. Certainly, I'll give it to him
B. No, please not
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A. Never mind
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A. Sorry, I don't need your help.
B. What help can you give us?
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A. That's OK.
B. What are you doing?
C. What's wrong with you?
D. Where have you been?
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A. She is a typist.
B. She is talking to her friend.
C. She is having a holiday.
D. She is my sister.
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A. Be hurry.
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A. I'd rather stay here if you don't mind.
B. Sorry, I don't like neither.
C. Certainly, why not？
D. Yes, we like these two places.
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A. I 'm a teacher.
B. I play football.
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A. That's right.
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___This is Mr Smith speaking now.
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A. Don't worry about it.
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A. Certainly
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