13级《电工仪表与测量》期中考试试卷

13级《电工仪表与测量》期中考试试卷
13级《电工仪表与测量》期中考试试卷

北海市电子职业技术学校2013年秋季学期2012级《电工仪表与测量》期末考试试题

班级_________姓名_________学号____ 分数_________

一、填空题(此题20空,每空2分,共40分)

1、数字式仪表所用的显示器一般采用显示器和显示器。

2、电流表在使用时要与被测电路______联,电压表在使用时与被测电路___ __联。

3、数字式仪表的核心是。

4、按仪表抵抗外磁场或电场的能力来分,电工仪表可分成_____、_____、_____、______ 四个等级。

5、仪表的误差可用 __________ 、_____________和____________误差来表示。

6、仪表的准确度通常用__________ 和仪表量程之比的百分数来表示。

7、指示仪表的测量机构通常由 ____________ 和 ___________部分组成。

8、磁电式仪表的磁场由________ 产生,它的线圈是流过被测电流。

9、电磁式仪表的缺点是___________、__________、______________易受外磁场干扰和____________。

二、选择题(每题只有一个选项是正确的,每题2分,共13题)

1. 有一个型号为“DD282”的仪表,它属于哪一类仪表()

A.安装式 B.便携式 C.电能表

2. 数字万用表测量直流电压时,将黑表笔插入“COM”插孔,红表笔插入()A.V·Ω B.COM

C.mA D.20A

3. 仪表的标度尺刻度不准造成的误差叫( )。

A.基本误差

B.附加误差

C.偶然误差

D.疏失误差4. 整流的作用是()

A.把交流电变为直流电 B.把直流电变为交流电

C.把直流电变为直流电 D.把交流电变为交流电

5. 电磁系测量机构主要由和组成。

A·固定的磁路系统和可动的软磁铁片

B·固定的通电线圈和可动的软磁铁片

C·固定的软磁铁片和可动的软磁铁片

D·固定的磁路系统和可动的通电线圈

6. 万用表测得电压或电流的读数是()

A.有效值 B.最大值

C.瞬时值 D.最小值

7. 仪表的准确度越高,基本误差越 ( )。

A.高

B.低

C.大

D.小

8. 选择仪表的准确度时,要求_____。

A. 越高越好

B. 越低越好

C. 无所谓

D. 根据测量的需要选择

9. 电工指示仪表的核心是()

A.测量线路 B.测量机构

C.游丝 D.刻度盘

10. 电磁系电流表是由电磁系测量机构与_____组成的。

A .并联分流电阻 B. 串联分流电阻 C. 串联分压电阻 D.并联分压电阻

11. 数字万用表的模拟部分不包括()

A.输入电路 B.模-数转换器

C.数字显示器 D.基准电压源

12. 可以测量电阻的比较式直流单臂电桥属于()0

A.指示仪表 B.比较仪表

C.数字仪表 D.智能仪表

13. 若要求精确测量交流电流时,应选用仪表。A·磁电系 B·电磁系

C·整流系 D·电动系

三、判断题(此题共14小题,每题1分,共14分)

1.万用表测电压时被测的电压值可以超出万用表的量程。()2.接在同一电流互感器上的仪表不能太多。()

3. 各种类型电工指示仪表的测量机构都是由固定部分和可动部分组成的。

()

4. 万用表的转换开关大多采用多刀多掷开关。()

5. 数字万用表一般采用比例法测电阻。()6.电磁系仪表指针的偏转角与被测电流的平方成反比,故标度尺刻度不均匀。

()

7. 磁电系电流表或电压表的刻度是不均匀的。()

8. 伏安法测电阻属于比较测量法。()

9. 数字式万用表测电阻属于直接法。()

10.模拟式万用表欧姆档量程的扩大是通过改变欧姆中心值来实现。()11.直流电磁式仪表是根据磁场对通电线圈受力的原理制成的。()12.磁电式仪表只能用来测量直流量。()13.电磁式仪表只能用来测量交流量。()14.磁电式电流表通常都采用附加分流器的方法来扩大量程。()

四、简答题(共3题,20分)

1. 简述用数字式万用表测量直流电压的步骤。(5分)

2. 常用电工仪表按结构和用途的不同,主要分为四类。有哪四类仪表,万用表属于哪一类?(5分)

3.用1.5级量程为250V的电压表分别测量220V和110V的电压,试计算其最大相对误差各为多少?(10分)

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