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最新《电子测量与仪器应用》试卷模拟卷

最新《电子测量与仪器应用》试卷模拟卷
最新《电子测量与仪器应用》试卷模拟卷

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《电子测量与仪器应用》试卷模拟卷

一. 填空题

1、数字的舍入规则是:大于5时 入 ;小于5时舍;恰好等于5时,采用 奇进偶不进 的原则。

2、被测量在特定时间和环境下的真实数值叫作 真值 。

3、 主振电路 是低频信号发生器的核心,其作用是产生频率范围连续可调 、稳定的低频正弦波信号。

4、模拟式电压表是以 指示器显示 的形式来指示出被测电压的数值。

5、若测量值为196,而实际值为200,则测量的绝对误差为 -4 ,实际相对误差为 -2% 。

6、电子测量包括 电子测量技术 和 电子测量仪器 两部分,两者密切相关。

7、测量误差是指 理论值 与 真实值 之间的差异。

8、通常把电桥分为两大类: 直流电桥 、 交流电桥 。

9、相对误差的表示方法有实际相对误差 、示值相对误差和满意相对误差三种。 10、用数字表示的测量结果,包含两个部分:数值和单位。

11、测量误差的来源有仪器误差、使用误差、人身误差、理论误差、影响误差。 12、测量误差的分类,根据测量的性质和特点,测量误差可分为系统误差、随机误差、

和粗大误差。

13、模拟电压表是以 指针偏转 的形式来指示出 被测电压 的数值。 14、数字频率计测量频率是基于 频率 的定义进行的。 二.判断题

1、函数信号发生器只能产生标准的正弦波信号。 (Х )

2、低频信号发生器在校准电子工业电压表时,可用作基准电压源。 (√ )

3、数字频率计主要用于测量信号的相位。(Х)

4、数字频率计测量信号的频率属于直接测量法。(√)

5、模拟电压表是以数码显示的形式来指示被测电压的数值。(Х)

6、用万用表测量直流电流时,应将两表笔串联在电路中。(√)

7、数字万用表主要由电量变换部分和数字显示部分组成。(√)

8、示波管是一种能将电信号转换成光信号的特殊三极管。(Х )

9、通常被测电压加在示波管的Y偏转板上。(√)

10、数字存储示波器除了能显示波形外,还能同时显示有关的参数。(√)

11、1.000A只有一位有效数字。(Х )

12、电子测量易于实现遥测和测量过程自动化。(√)

13、在测量结果的数字列中,前面的“0”都是有效数字。(Х)

14、在对测量结果进行处理时,数字的舍入原则为四舍五入。(Х)

15、测量低频信号时不宜直接测量频率,否则将产生很大的量化误差。(√)

16、相位是用来表征正弦信号在某一时刻的状态。(√)

17、函数信号发生器只能产生标准的正弦波信号。(Х)

18、低频信号发生器在校准电子工业电压表时,可用作基准电压源。(√)

19、数字频率计主要用于测量信号的相位。(Х)

20、数字频率计测量信号的频率属于直接测量法。(√)三.选择题

1、示波器上的聚焦旋钮是用来调节( B )。

A、光点的位置

B、光点的大小

C、光点的亮度

D、扫描电压的频率

2、低频信号发生器对功率放大器的要求是( A )。

A 有额定的输出功率、效率高、非线性失真小

B 有额定的输出功率、效率低、非线性失真小

C 有足够大的输出功率、效率高、非线性失真大

D 有很大的输出功率、效率低、非线性失真大

3、低频信号发生器中的电源采用的是( C )。

A 高压交流电源

B 低压交流电源

C 直流稳压电源

D 交流稳压电源

4、高频信号发生器中主振器的作用是产生( B )。

A 高频等频正弦信号

B 高频等幅正弦信号

C 等频调幅信号

D 等频正弦信号

5、高频信号发生器中的衰减器的作用是( B )。

A 改变输入信号的幅度

B 改变输出信号的幅度

C 改变输入信号的频率

D 改变输出信号的频率

6、广泛用于网络特性的观察、调整、检验和动态测量的仪器是( B )。

A.示波器 B 扫频仪 C 频率计 D 晶体管特性图示仪

7、在放大电路中,输出信号相对于输入波形产生了畸变,这种失真称为( A )

A 非线性失真

B 线性失真

C 交越失真

D 相位失真

8、( D )能显示出信号各频率分量的幅度和频率之间的关系。

A 数字频率计

B 低频信号发生器

C 示波器

D 频谱仪

9、( B )是在示波管上直接显示被测网络幅频特性的测量仪器。

A.示波器 B 扫频仪 C 频率计 D 晶体管特性图示仪

10、测量精密电阻的电阻值通常采用的是( B )。

A.万用表 B 直流电桥 C 示波器 D Q表

11、25.5×105Ω应记作( D )MΩ

A 25.5

B 255

C 25×102

D 2.55

12、下列各个数字中的有效数字保留到小数点后两位数,符合舍入规则的是

(C )

A 25.543→25.55

B 22.668→22.66

C 10.535→10.54

D 2.552→

2.56

13、RC文氏电桥振荡器是一种电压反馈式振荡器,它由( D )和一个具有选频作用的RC正反馈网络组成。

A 交流放大器

B 直流放大器

C 功率放大器

D 同相运算放大器

14、振荡器是低频信号发生器的核心,其作用是产生频率连续可调、稳定的

( A )。

A 正弦波电压

B 方波

C 锯齿波

D 梯形波

15、数字式频率计可以用来测量( C )。

A 信号的失真度

B 信号的功率

C 信号的频率

D 信号的幅度

16、函数信号发生器采用( C )对积分器中的电容进行充、放电来产生三角波和方波。

A 恒压源

B 电池

C 恒流源

D 电压源

17、为了便于对各种信号发生器给出的幅度进行调节,在仪器中都设置了衰减器,其中( A )最为精细。

A 高频信号发生器

B 函数信号发生器

C 低频信号发生器

D 脉冲信号

发生器

18、函数信号发生器可产生( A )。

A 任意波形

B 三角波

C 方波

D 正弦波

19、用数字频率计进行测量时,在同样的闸门时间的情况下,被测频率越高,误差就( A )。

A 越小

B 越大

C 不会改变

D 为零

20、为了显示出各种半导体器件特性曲线的测量仪器是( D )

A.示波器 B。扫频仪 C。频率计 D。晶体管特性图示仪

四.解答题

1、什么是锁相环,主要模块组成有哪些?

(1)锁相环(phase locked loop),顾名思义,就是锁定相位的环路。学过自动控制原理的人都知道,这是一种典型的反馈控制电路,利用外部输入的参考信号控制环路内部振荡信号的频率和相位,实现输出信号频率对输入信号频率的自动跟踪,一般用于闭环跟踪电路。

(2)最主要包括鉴频鉴相器、压控振荡器。

2、电子测量的特点有哪些?

答:电子测量有以下几个明显的特点:

1、频率范围宽;

2、量程广;

3、测量准确度高;

4、测量速度快;

5、易于实现遥测和测量过程的自动化。

3、电子测量的日常维护主要有哪七个方面?

答:电子测量仪器日常维护的内容主要有以下几个方面:

1、保持清洁;

2、保持干燥及通风;

3、防腐;

4、防振动;

5、防漏电;

6、定期计量;

7、合理放置。

五.综合应用题

1.如果按下电源开关示波器仍然黑屏,没有任何显示,该如何处理:

(1)检查电源接头是否接好。

(2)检查电源开关是否按实。

(3)做完上述检查后,重新启动示波器。

(4)如果仍然无法正常使用本产品,请与RIGOL联络,让我们为您服务。

2、用两个电压表分别测得U1x=95V,U2x=12V,已知被测量的实际值分别为

U1A=100V,U2A=10V,求两次测量的绝对误差和实际相对误差。

答:△A1=U1x-U1A=95-100=-5V

=△A1/ U1A*100%=-5/100*100%=-5%

△A2=U2x-U2A=12-10=2V

=△A1/ U1A*100%=2/10*100%=20%

2020年单招考试语文模拟试题及答案

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1.下列词语中加点的字,读音全都正确的一组是( )

A、逾越(yú) 鸟瞰(kàn) 一丘之貉(luò) 栩栩如生(xǔ)

B、溃败(kuì) 凹陷(wā) 贻笑大方(yí) 兢兢业业(jīng)

C、咀嚼(zǔ) 桧柏(guì) 罄竹难书(qìng) 饕餮大餐(tié)

D、觊觎(jì) 攻讦(jié) 光阴荏苒(rǎn) 心怀叵测(pǒ)

2.依次填入下列各句横线处的词语,恰当的一组是( ) (1)、由于教师与家长缺乏有效的,两者关系紧张是当前的普遍现象。

(2)、多渠道、多层次、全方位__特区人才成长的“立交桥”,培养更多更好的特区建设者。

(3)、买彩票当然是希望有机会中大奖,但彩民不要__地去追求这种机会。

(4)、德国一项调查结果__,如今德国儿童的上网比例已高达3 7%。

A、沟通修建锐意显示

B、勾通修建锐意

体现

C、沟通构建刻意显示

D、勾通构建刻意

体现

3.下列各句中,修辞手法判断有误的一项是( )

A、叶子出水很高像亭亭的舞女的裙。(比喻)

B、山舞银蛇,原驰蜡象。(对偶)

C、胡老爹方才这个嘴巴打的亲切,少顷范老爷洗脸,还要洗下半盆猪油来!(夸张)

D、蜀道之难,难于上青天!(互文)

4.下列句子中,加点的词语使用正确的一项是( )

A、昨天,故宫博物院失窃案审理完毕,犯罪嫌疑人石柏魁获刑13年,博物院方面表示,警方璧还的四件失窃文物,受损的那一件正在修复中,不久,它们将与观众见面。

B、据媒体报道,在安南特使的斡旋之下,叙利亚总统巴沙尔有意与反对派唱一出将相和,可是,这个消息,目前还未得到叙利亚政府的论实。

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