《电子技术基础》习题三答案教程文件

《电子技术基础》习题三答案教程文件
《电子技术基础》习题三答案教程文件

《电子技术基础》习

题三答案

《电子技术基础》习题三答案

一、单项选择题(本大题共30小题,每小题2分,共60分)

1、测得处于放大状态的某三极管当I B=30μA时,I C=2.4mA;I B=40μA时,I C=3mA;该三极管的交

流放大倍数为( B )

A、80

B、60

C、75

D、100

2、图示三极管应用电路中,三极管的U BE= 0.6V,β=50,如果近似认为三极管集电极与发射极间

饱和电压U CES≈ 0,则三极管的集电极电流I C ( C )。

A、等于5mA

B、等于3mA

C、约等于4mA

D、等于0

R B

+12V

114k

3、图示三极管应用电路中,三极管工作在 ( C )。

A、截止区

B、饱和区

C、放大区

D、击穿区

R

B

+12V

114kΩ

4、测得放大电路中某三极管各管脚对参考点的电位分别为:管脚①2.3V,管脚②3V,管脚③-

9V,则可判定( D )。

A、该三极管是锗管且管脚①是发射极

B、该三极管是硅管且管脚③是发射极

C、该三极管是硅管且管脚①是发射极

D、该三极管是硅管且管脚②是发射极

5、增强型NMOS管的电路符号是下图中的( A )

B

A B C D

6、图示差动电路,在电路非理想对称的条件下,增大R E对放大电路性能的影响是( B )。

A、提高共模电压放大倍数

B、提高共模抑制比

C、提高差模电压放大倍数

D、增加差模输入电阻

7、图示差动电路中,增加R E对放大电路性能的影响是( C )。

A、减小共模抑制比

B、减小差模电压放大倍数

C、减小共模电压放大倍数

D、增加差模输入电阻

u

I2

8、功率放大电路如图所示,三极管的饱和压降U CES=2V,该电路的最大效率ηmax为( B )。

A、78.5%

B、62.8%

C、50%

D、100%

u o

9、功率放大电路如图所示,三极管的饱和压降U CES=2V,则负载R L可获得的最大不失真功率P omax

为( B )。

A、6.25W

B、4W

C、12.5W

D、8W

u o

10、为了提高放大电路的效率和带负载能力,多级放大电路的输出级常采用( A )。

A、互补对称功率放大电路

B、三极管差动放大电路

C、共发射极放大电路

D、共集电极放大电路

11、图示电路中R F引入的级间反馈类型为( C )。

A、串联电压负反馈

B、串联电流负反馈

C、并联电压负反馈

D、并联电流负反馈

u u O

12、图示电路中R F引入的级间反馈类型为( A )

A、串联电压负反馈

B、串联电流负反馈

C、并联电压负反馈

D、并联电流负反馈

u

13、在放大电路中引入负反馈后,对放大电路性能的影响是( B )。 A 、增大放大倍数,提高放大倍数的稳定性 B 、减小放大倍数,改善非线性失真 C 、提高输入电阻,减小输出电阻 D 、减小放大倍数,消除非线性失真 14、集成稳压电源W7805应用电路如图所示,输出电压U O 的大小为( C )。 A 、5V B 、6V C 、11V D 、18V

U O

15、逻辑电路如图所示,TTL 逻辑门电路的关门电阻R OFF =0.7k ?,开门电阻R ON =2k ?,在上拉电阻

R U 取值正常的情况下,输出端F 的逻辑表达式为( A )。 A 、F AB C =+ B 、F AB = C 、F AB C =+ D 、F ABC =

F

16、三态门电路如图所示,则F 的逻辑表达式为( D )。

A 、F AE BE =+

B 、F AE BE =+

C 、F AE BE =+

D 、F A

E BE =+

F

E

17、图示逻辑电路中,已知TTL 门电路的关门电阻R OFF =0.7k Ω,开门电阻R ON =2k Ω,则输出输出F

的逻辑表达式为( B )。

A 、F ABC =

B 、F

C = C 、F ABC =

D 、F A BC =+

A C

B

F

&

&

10k Ω

18、对TTL 与非门电路多余的输入端子,不可以( C ).

A 、接高电位

B 、与有用输入端子并联

C 、接地

D 、通过10k Ω电阻接地 19、TTL 逻辑电路如图所示中、输出F 的高、低电平值约为( D )。 A 、OH OL 5V,0V U U == B 、OH OL 3.6V,0.3V U U == C 、OH OL 15V,0V U U == D 、OH OL 15V,0.3V U U ==

F

20、时序逻辑电路如图(a)所示,设D 触发器的初始状态为“0”,在时钟脉冲CP 作用下Q 端的波

形为图(b)中的( D )。

Q

C1

1D Q

CP

CP

Q Q

Q Q

C.D.A.B.图(a)

图(b)

21、JK 触发器组成的电路如图(a)所示,设触发器的初始状态为“0”,时钟脉冲CP 的波形如图(b)中所示,则输出Q 的波形为图(b)中的( A )。

CP

Q Q

Q Q

A.B.C.D.图(a)

图(b)

22、555集成定时器构成的应用电路如图所示,当开关S 接通后扬声器( A )。

A 、将会一直发出声响

B 、发出声响一段时间后自动停止

C 、永远不会发出声响

D 、开始不会发出声响,延时一段时间后会一直发出声响

CC

C

23、由555集成定时器构成的应用电路如图所示,当把按钮SB 按下并迅速释放后,发光二极管

( C )。

A 、将会一直发光

B 、永远不会发光

C 、发光一段时间后自动熄灭

D 、开始不发光,过一段时间后一直发光

20k 1

24、具有定时功能的电路是( C )。

A 、多谐振荡器

B 、双稳态触发器

C 、单稳态触发器

D 、施密特触发器

25、某10位数模转换器,当输入二进制数为0000000001时,输出为0.01V ,若输入二进制数为

010*******时,输出将为( C )。

A 、0.7325V

B 、1.465V

C 、2.93V

D 、5.86V

26、在数字系统中,为了把模拟量转换为数字量,应采用的集成器件是( B )。 A 、D/A 转换器 B 、A/D 转换器 C 、计数器 D 、译码器

27、在数字系统中,为了把数字量转换为模拟量,应采用的集成器件是( A )。

A、D/A转换器

B、A/D转换器

C、计数器

D、译码器

的ROM,其地址线数和位线数分别为( D )。

28、存储容量为8k8

A、12和7

B、8和12

C、8和13

D、13和8

29、为了将1k×4的RAM扩展为4k×8的RAM,所需的1k×4的RAM片数为( D )

A、2片

B、4片

C、6片

D、8片

30、交流放大电路如图所示,已知三级管β=100,U BE= 0.6V,其余参数值如图中所示,电压放大倍数A u为( B )

A、-0.99

B、0.99

C、-1.98

D、1.98

二、判断题(本大题共20小题,每小题2分,共40分,正确填“T”,错误填“F”)

1、各种比较器的输出只有两种状态。( T )

2、微分运算电路中的电容器接在电路的反相输入端。( T )

3、理想运放的两个重要结论是虚短与虚地。( F )

4、集成运放一般分为两个工作区,它们分别是线性与非线性区。( T )

5、分析集成运放的非线性应用电路时,不能使用的概念是虚断。( F )

6、集成运放的反相输入端为虚地时,同相端所接的电阻起平衡作用。( T )

7、绝缘栅型场效应管的输入电流不为零。( F )

8、正弦电流经过二极管整流后的波形为仍为正弦。( F )

9、若使三极管具有电流放大能力,必须满足的外部条件是发射结反偏、集电结反偏。( F )

10、N型半导体中的多子是带负电的自由电子载流子,P型半导体中的多子是带正电的空穴载流子,因此说N型半导体带负电,P型半导体带正电。( F )

11、放大电路中的输入信号和输出信号的波形总是反相关系。( F )

12、“虚地”现象只存在于反相的线性应用运放电路中。( T )

13、射极输出器的电压放大倍数等于1,因此它在放大电路中作用不大。( F )

14、集成运放使用时不接负反馈电路中的电压增益称为开环电压增益。( F )

15、设置静态工作点的目的是让交流信号叠加在直流量上全部通过放大器。( T )

16、“虚地”是指该点与“地”点相接后具有“地”点的电位。( F )

17、微变等效电路不能进行静态分析,也不能用于功放电路分析。( T )

18、集成运放在开环状态下输入与输出之间存在线性关系。( F )

19、微变等效电路中不但有交流量,也存在直流量。( F )

20、理想运放构成的线性应用电路电压增益与运放本身的参数无关。( F )

试卷3及参考答案

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