digital electronics(南京工业职业技术大学)mooc慕课答案2026年版满分测试WYC

对应课程:点击查看
起止时间:2019-02-18到2019-06-30
更新状态:已完结

1 Introductory Concepts Test 1 of Introduction

1、 An analog quantity is one having () values

A:continuous
B:discret
C:0
D:1
答案: continuous

2、 A digital quantity is one having a () set of values

A:continuous
B:discrete
C:0
D:1
答案: discrete

3、 Each of the two digits in the binary system, 1, and 0, is called a ()

A:bit
B:byte
C:word
D:none of the above
答案: bit

4、 The voltage used to represent a 1 and a 0 are called ()

A:logic levels
B:digigal levels
C:high levels
D:low levels
答案: logic levels

5、 () consists of voltage levels that are changing back and forth between the HIGH AND LOW levels or states

A:Digital waveforms
B:analog waveforms
C:high waveforms
D:low waveforms
答案: Digital waveforms

6、 most waveforms enountered in digital systems are composed of series of pulses,somethiems caled ()

A:pulse trains
B:period
C:frequency
D:phase
答案: pulse trains

7、 A periodic pulse waveform is one that repeats itself at a fixed interval, calle a ()

A:Period
B:Frequecny
C:Phase
D:None of the above
答案: Period

8、 In a portion of a periodic digital waveform, the measurements are in milliseconds, Period T=10, Width=1. Determining the duty cycle by

A:100hz
B:10ms
C:10%
D:none of the above
答案: 10%

9、 Binary means having () states or values

A:2
B:3
C:4
D:5
答案: 2

10、 Rise time of a waveform is the waveform rising from () to 90% of amplitude

A:10%
B:20%
C:30%
D:5%
答案: 10%

11、 Generally, 1 is represented by the higher voltage, which we will refer to as a

A:HIGH
B:LOW
C:BOTH OF HIGH AND LOW
D:NONE OF THE ABOVE
答案: HIGH

12、 A binary digit, which can be only 0

A:正确
B:错误
答案: 错误

13、 Binary has two values, 1 and 0

A:正确
B:错误
答案: 正确

14、 tempreture is a digital signal

A:正确
B:错误
答案: 错误

15、 digital signal has a set of discret values

A:正确
B:错误
答案: 正确

16、 the ratio of the pulse width to the period of a digital waveform,expressed as a percentage

A:正确
B:错误
答案: 正确

17、 a basic logic operation that performs inversions

A:正确
B:错误
答案: 正确

18、 Pulse is a sudden change from one level to another

A:正确
B:错误
答案: 正确

19、 Timing diagram is a graph digital waveform showing the time relationship of two or more waveforms

A:正确
B:错误
答案: 正确

20、 the term bit means 1 and 0

A:正确
B:错误
答案: 错误

21、 frequency is the reciprocal of the period

A:正确
B:错误
答案: 正确

22、 The frequency of a pulse waveform is the reciprocal of the period, the relationship between frequecy and period is expressed by
答案: f=1/t

23、 the duty cycle can be expressed by() , tw stands for the pulse width, and T stands for period
答案: (tw/T)100%

24、 When the music was originally recorded on the CD, a process, essentially the reverse of the one described here, using an () was used
答案: DAC

25、 For a digital waveform, a () that occurs first at time t0 and a trailing edge that occurs last time t1
答案: leading edge

26、 the period times its frequency, and we may get
答案: 1

27、 A digital waveform carries () information
答案: binary

28、 when bits are transfered in () form from one point to another, they are sent one bit at a time along a single line.
答案: serial

29、 IC packages includes DIP, it is
答案: Dual in-line packages

30、 analog signal is continuous or having () values
答案: continuous

31、 pressure carries () signal
答案: analog

2 Number Systems, Operations, and Codes Unit 2 test

1、 In decimal system, there are 9 digit