《数字电路与逻辑设计》-模拟题

数字电路与逻辑设计模拟题

一、单选题

1.由n 个变量构成的最大项,有()种取值组合使其值为1.

A.n

B.2n

C.n 2

D.12 n

[答案]:D

2.用卡诺图化简包含无关条件的逻辑函数时,对无关最小项().

A.不应考虑

B.令函数值为1

C.令函数值为0

D.根据化简的需要令函数值为0或者1

[答案]:D

3.组合电路中的冒险现象是由于()所引起的.

A.电路未达到最简

B.电路有多个输出

C.电路中存在时间延迟

D.电路中逻辑门的类型不同

[答案]:C

4.设计一个模10计数器需要()个触发器.

A.3

B.4

C.6

D.10

[答案]:B

5.4线-16线译码器有()输出信号.

A.1

B.4

C.8

D.16

[答案]:D

6.EEPROM 是指()

A.随机读写存储器

B.一次编程的只读存储器

C.可擦可编程只读存储器

D.电可擦可编程只读存储器

[答案]:D

7.电平异步时序逻辑电路不允许两个或两个以上输入信号().

A.同时为0

B.同时为1

C.同时改变

D.同时作用

[答案]:C

8.下列逻辑门中,()可以实现三种基本运算.

A.与门

B.或门

C.非门

D.与非门

[答案]:D

9.标准与-或表达式是由()构成的逻辑表达式.

A.与项相或

B.最小项相或

C.最大项相与

D.或项相与

[答案]:B

10.表示任意两位无符号十进制数至少需要()二进制数.

A.6

B.7

C.8

D.9

[答案]:B

11.下列选项中,()不是单稳态触发器的特点.

A.有一个稳定状态,有两个暂稳状态

B.暂稳状态维持一段时间后,将自动返回稳定状态

C.暂稳状态时间的长短与触发脉冲无关,仅决定于电路本身的参数[答案]:A

12.十进制数25用8421BCD码表示为().

A.10101

B.00100101

C.100101

D.10101

[答案]:B

13.在下列逻辑电路中,不是组合逻辑电路的有().

A.锁存器

B.编码器

C.全加器

D.选择器

[答案]:A

14.随机存取存储器具有()功能.

A.读/写

B.无读/写

C.只读

D.只写

[答案]:A

15.逻辑关系为“一件事情的发生是以其相反的条件为依据”的逻辑门是().

A.与门

B.非门

C.异或门

D.同或门

[答案]:B

16.有一个4位的D/A转换器,设它的满刻度输出电压为10V,当输入数字量为1101时,输出电压为().

A.8.125V

B.4V

C.6.25V

D.9.375V

[答案]:A

17.一只四输入端或非门,使其输出为1的输入变量取值组合有()种.

A.15

B.8

C.7

D.1

[答案]:D

18.有一个左移移位寄存器,当预先置入1011后,其串行输入固定接0,在4个移位脉冲CP作用下,四位数据的移位过程是().

A.1011--0110--1100--1000--0000

B.1011--0101--0010--0001--0000

C.1011--1100--1101--1110--1111

D.1011--1010--1001--1000--0111

[答案]:A

19.在下列逻辑电路中,是时序逻辑电路的有()

A.加法器

B.读/写存储器

C..编码器

D.数值比较器

[答案]:B

20.函数F=AB+BC,使F=1的输入ABC组合为()

A.ABC=000

B.ABC=010

C.ABC=101

D.ABC=110

[答案]:D

21.下列选项中,叙述不正确的是()

A.任意两个不同的最小项之积,值恒为0.

B.RAM的特点是一旦停电,所存储的内容不会丢失

C.在逻辑代数中,常用的逻辑运算是与非,或非,与或非,异或等

D.单向导电特性是半导体二极管最显著的特点

[答案]:B

22.下列选项中,叙述不正确的是()

A.接入滤波电容引入是消除竞争冒险的方法之一

B.引入选通脉冲不能消除竞争冒险

C.修改逻辑设计,增加冗余项是常用的消除竞争冒险的方法

D.化简电路,减少逻辑器件数目,不能消除竞争冒险

[答案]:B

23.常用的BCD码有()

A.奇偶校验码

B.格雷码

C.ASCII码

D.余三码

[答案]:D

24.以下参数不是矩形脉冲信号的参数?()

A.周期

B.占空比

C.脉宽

D.扫描期

[答案]:D

25.在何种输入情况下,“与非”运算的结果是逻辑0.()

A.全部输入是0

B.任一输入是0

C.仅一输入时0

D.全部输入是1

[答案]:D

二、多选题

1.下列信号中,()是数字信号.

A.交流电压

B.开关状态

C.交通灯状态

D.无线电载波

[答案]:B,C

2.小数"0"的反码形式有().

A.0.0 0

B.1.0 0

C.0.1 (1)

D.1.1 (1)

[答案]:A,D

3.设两输入或非门的输入为x 和y,输出为z,当z 为低电平时,有().

A.x 和y 同为高电平

B.x 为高电平,y 为低电平

C.x 为低电平,y 为高电平

D.x 和y 同为低电平

[答案]:A,B,C

4.在下列触发器中,输入没有约束条件的是().

A.时钟R-S 触发器

B.基本R-S 触发器

C.主从J-K 触发器

D.维持阻塞D 触发器

[答案]:C,D

5.四位双向移位寄存器74194控制输入端S 1S 0的取值可以是().

A.00

B.01

C.10

D.11

[答案]:A,B,C,D

三、判断题

1.原码和补码均可实现将减法运算转化为加法运算.()

[答案]:错误

2.逻辑函数(0,2,5) m C)B,F(A,∑=,则7)m(1,3,4,6,C)B,(A,F ∑=.()

[答案]:正确

3.由与非门构成的基本RS触发器不允许两个输入端同时为0.()

[答案]:正确

4.由逻辑门构成的电路一定是组合逻辑电路.()

[答案]:错误

5.同步时序电路中作为存储元件的触发器必须是带时钟控制端的触发器.() [答案]:正确

6.脉冲异步时序逻辑电路不允许两个或两个以上的输入端同时出现脉冲.() [答案]:正确

7.最大等效类是指包含状态数目最多的等效类.()

[答案]:错误

8.Mealy型电路的输出是输入和状态的函数.()

[答案]:正确

9.用三个触发器作为存储元件可构建一个同步模10计数器.()

[答案]:错误

10.并行加法器采用先行进位(并行进位)的目的是简化电路结构.()

[答案]:错误

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