大学MOOC digital electronics(南京工业职业技术大学)1003254012 最新慕课完整章节测试答案
1 Introductory Concepts
QUIZ 1
1、判断题：
An analog quantity is one having continuous values
选项：
A: 正确
B: 错误
答案: 【 正确】
2、判断题：
A digital quantity has ten discret values
选项：
A: 正确
B: 错误
答案: 【 错误】
3、判断题：
There are two digits in the binary system
选项：
A: 正确
B: 错误
答案: 【 正确】
4、判断题：
The term bit is short for binary digit
选项：
A: 正确
B: 错误
答案: 【 正确】
5、判断题：
In postive logic, a LOW level represents a binary 1
选项：
A: 正确
B: 错误
答案: 【 错误】
6、判断题：
If the period of a pulse waveform increases, the frequency also increases
选项：
A: 正确
B: 错误
答案: 【 错误】
7、判断题：
A timig diagram shows the timing relationshiop of two or more digit waveforms
选项：
A: 正确
B: 错误
答案: 【 正确】
8、判断题：
The basic logic operations are AND, OR and MAYBE
选项：
A: 正确
B: 错误
答案: 【 错误】
9、判断题：
If the input to an inverter is a 1,the output is a 0
选项：
A: 正确
B: 错误
答案: 【 正确】
Test 1 of Introduction
1、单选题：
An analog quantity is one having () values
选项：
A: continuous
B: discret
C: 0
D: 1
答案: 【 continuous】
2、单选题：
A digital quantity is one having a () set of values
选项：
A: continuous
B: discrete
C: 0
D: 1
答案: 【 discrete】
3、单选题：
Each of the two digits in the binary system, 1, and 0, is called a ()
选项：
A: bit
B: byte
C: word
D: none of the above
答案: 【 bit】
4、单选题：
The voltage used to represent a 1 and a 0 are called ()
选项：
A: logic levels
B: digigal levels
C: high levels
D: low levels
答案: 【 logic levels】
5、单选题：
() consists of voltage levels that are changing back and forth between the HIGH AND LOW levels or states
选项：
A: Digital waveforms
B: analog waveforms
C: high waveforms
D: low waveforms
答案: 【 Digital waveforms】
6、单选题：
most waveforms enountered in digital systems are composed of series of pulses,somethiems caled ()
选项：
A: pulse trains
B: period
C: frequency
D: phase
答案: 【 pulse trains】
7、单选题：
A periodic pulse waveform is one that repeats itself at a fixed interval, calle a ()
选项：
A: Period
B: Frequecny
C: Phase
D: None of the above
答案: 【 Period】
8、单选题：
In a portion of a periodic digital waveform, the measurements are in milliseconds, Period T=10, Width=1. Determining the duty cycle by
选项：
A: 100hz
B: 10ms
C: 10%
D: none of the above
答案: 【 10%】
9、单选题：
Binary means having () states or values
选项：
A: 2
B: 3
C: 4
D: 5
答案: 【 2】
10、单选题：
Rise time of a waveform is the waveform rising from () to 90% of amplitude
选项：
A: 10%
B: 20%
C: 30%
D: 5%
答案: 【 10%】
11、单选题：
Generally, 1 is represented by the higher voltage, which we will refer to as a
选项：
A: HIGH
B: LOW
C: BOTH OF HIGH AND LOW
D: NONE OF THE ABOVE
答案: 【 HIGH】
12、判断题：
A binary digit, which can be only 0
选项：
A: 正确
B: 错误
答案: 【 错误】
13、判断题：
Binary has two values, 1 and 0
选项：
A: 正确
B: 错误
答案: 【 正确】
14、判断题：
tempreture is a digital signal
选项：
A: 正确
B: 错误
答案: 【 错误】
15、判断题：
digital signal has a set of discret values
选项：
A: 正确
B: 错误
答案: 【 正确】
16、判断题：
the ratio of the pulse width to the period of a digital waveform,expressed as a percentage
选项：
A: 正确
B: 错误
答案: 【 正确】
17、判断题：
a basic logic operation that performs inversions
选项：
A: 正确
B: 错误
答案: 【 正确】
18、判断题：
Pulse is a sudden change from one level to another
选项：
A: 正确
B: 错误
答案: 【 正确】
19、判断题：
Timing diagram is a graph digital waveform showing the time relationship of two or more waveforms
选项：
A: 正确
B: 错误
答案: 【 正确】
20、判断题：
the term bit means 1 and 0
选项：
A: 正确
B: 错误
答案: 【 错误】
21、判断题：
frequency is the reciprocal of the period
选项：
A: 正确
B: 错误
答案: 【 正确】
22、填空题：
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、填空题：
the duty cycle can be expressed by() , tw stands for the pulse width, and T stands for period
答案: 【 (tw/T)100%】
24、填空题：
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、填空题：
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、填空题：
the period times its frequency, and we may get
答案: 【 1】
27、填空题：
A digital waveform carries () information
答案: 【 binary】
28、填空题：
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、填空题：
IC packages includes DIP, it is
答案: 【 Dual in-line packages】
30、填空题：
analog signal is continuous or having () values
答案: 【 continuous】
31、填空题：
pressure carries () signal
答案: 【 analog】
Test 2
1、单选题：
what is a digital signal? ()
选项：
A: discrete signals
B: continuous signals
C: both of a and b
D: signals exist in the world
答案: 【 discrete signals】
2、单选题：
which is the digital quantity? ()
选项：
A: time
B: pressure
C: sound
D: tempreature values per hour
答案: 【 tempreature values per hour】
3、单选题：
how is the sound should be recorded in the computer?
选项：
A: sound waves are picked up by a microphone and converted to a small analog vltage,this voltage is applied to a analog to digital converter. sound is stored in a computer as a digital signal.
B: sound waves ware picked up by a microphone and converted to a small analog voltage, this voltage is applied to digital to analog converter. sound is stored in a computer as a digital signal.
C: sound waves are picked up by a microphone and converted to a small analog voltage, this voltage is applied to analog to digigal convertere, sound is stored in a computer as a analog signal.
D: sound waves are picked up by a microphone and converter to a small voltage, this voltage is applied to analog converter, sound is stored in a computer as analog signal.
答案: 【 sound waves are picked up by a microphone and converted to a small analog vltage,this voltage is applied to a analog to digital converter. sound is stored in a computer as a digital signal.】
Test
1、判断题：