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《电子元件识别与检测》期中考试试卷

《电子元件识别与检测》期中考试试卷

2014下学期《电子元件识别与检测》期中考试试卷班级:________ 姓名:_________ 学号:______ 计分:______

一、填空题(每空2分共30分)

1、电路中常用的电子元器件有_____、______、_______、_______。

2、电阻的常用单位是指______、_______、_______。

3、三极管的三个电极是_____、_____、_______。

4、万用表是一种可以用来测试______、______、______的仪表。

5、电阻的常用三种连接方式是________、________、________。

二、选择题(每题2分共20分)

1、一个色环电阻其彩色标示为灰、红、红、金,其阻值应为( )。

A、100欧

B、120欧

C、8.2K

D、1.5K

2、测试电阻时,应该使用的仪表是()。

A、电流表

B、电压表

C、欧姆表

3、进行24V直流电压测试,应采用的最佳量程为()。

A、50V

B、500V

C、1000V

D、750V

4、测试交流电压时,要选用的正确功能是()。

A、欧姆表

B、交流电压表

C、直流电压表

D、电流表

5、三极管的主要作用是( )。

A、单向导通

B、放大

C、镇流

D、检波

6、电容器的两个重要参数是()

A、阻值、电压

B、容量、耐压值

C、容量、正负值

D、阻值、容量

7、某一可调电阻标示为504,其阻值应为()。

A、50k

B、500k

C、5M

D、50M 8、电阻的串联其基本含义是()。

A、两个以上电阻首尾相接

B、两个或两个以上电阻首尾相接

9、电路中电流为零,电路的工作状况可能是()。

A、开路

B、短路

C、通路

10、一个四色环电阻,其阻值大小由第三色环数字决定,若为橙色,则倍数是()。

A、10倍

B、100 倍

C、1000倍

D、10000倍

三、判断题(每题3分共30分)

1、场效应管的三个电极是:阴极、漏极极、控制栅极。()

2、电容串联连接,电容值会变小,电阻串联连接阻值会加大。()

3、三极管的三种工作状态是指放大、截止、饱和。()

4、一个色环电阻的标示为棕、绿、红、金,其阻值为150K。()

5、万用电表是一种多用途的测量仪表,主要用来测试电压、电阻及电流。()

6、二极管的基本特性是:单向导电。()

7、所谓直流电就是指大小和方向都不随时间而变化的电流或电压。()

8、三极管是一种电流控制器件而场效应管是一种电压控制器件。()

9、电感具有通高频阻低频的作用,也可以充当电源滤波器件。()

10、NTC称为负温度系数热敏电阻,PTC称为正温度系数热敏电阻。()

四、简要说明如何用万用表判断二极管的材料、正负极、好坏。(20分)

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