2019-2020年中职职高机床电气控制技术期末试题及答案

2019-2020年中职职高机床电气控制技术期末试题及

答案

一、填空题：

1、电器按动作性质分为手动和自动电器。

2、接触器的结构主要由电磁机构，触头系统，灭弧装置等组成。

3、电流继电器的励磁线圈应串接于被测量电路。

4、中间继电器具有触点对数多，容量小的特点。

5、常见的灭弧方法有电动力吹弧，窄缝灭弧室，栅片灭弧，磁吹灭弧。

6、机械开关电器在需要修理或更换机械零件前所能承受的无载操作

次数，称为机械寿命。在正常工作条件下，机械开关电器无需修理或更换零件的负载操作次数称为电寿命。

7、电气控制系统中常见的保护线路用欠压保护、过载保护、缺相保护、短路保护和电气、机械互锁等。

8. 中间继电器在电路中的作用是增加触头的数目；热继电器在电路

中的作用是过载保护，熔断器在控制线路中的作用是短路保护。

9. 通常构成机械设备的电气工程图有电气原理图、电器位置图和安

装接线图等三种。而设计电气控制线路，常用的方法是经验设计法和逻辑设计法。

10. 交流接触器从结构上看是由触头系统、触头系统和灭弧装置、以及其他部分组成，通常用它可作为零压保护和欠压保护。

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