2020 信号与系统（英文）(北京交通大学) 最新满分章节测试答案

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本课程起止时间为:2020-09-09到2020-12-20
本篇答案更新状态:已完结

CHAPTER I – Course Overview Test on Chapter 1

1、 问题:Which of the below deterministic signals is a continuous-time energy signal: (    ).‍
选项：
A:
B:
C:
D: 
答案: 【】

2、 问题:Given a periodic continuous-time signal , what is the signal’s period  and the average power   ? (    )
选项：
A:
B:
C:
D:
答案: 【】

3、 问题:Given the below relationships between the voltage and the current, please pick the system that is time-variant (    ).
选项：
A:
B:
C:
D:
答案: 【】

4、 问题:Below are four discrete-time system and the relationship between the input, , the output,  , and the initial state,  is given for each of the systems. Which is not a linear system? (    )
选项：
A:
B:‍
C:
D:
答案: 【】

5、 问题:Given the relationship between the input , the output , and the initial state , which of the systems is a linear system? (    )
选项：
A:
B:
C:
D:
答案: 【】

6、 问题:Which of the below system is a time-invariant system? Given that or is the input of the system and  or is the output.  (   )
选项：
A:
B:
C: 
D:
答案: 【】

7、 问题:Given the difference equation of a discrete-time system is , then the system is (    ).
选项：
A:Causal and linear time-invariant.
B:Causal and linear time-varient.
C:Non-causal and linear time-invariant.
D:Non-causal and linear time-variant. 
答案: 【Causal and linear time-invariant.】

8、 问题:For a linear continuous-time system, when the initial state is and the input signal is , the output is , ; when the initial state is and the input signal is , the output is , . Then, what is the output when the  initial state is and the input signal is ?  (   )
选项：
A:
B:,
C:,
D:,
答案: 【, 】

CHAPTER II – Signal Analysis in the Time Domain Test on Chapter 2

1、 问题:A sinusoidal signal  can be represented by using imaginary exponential signal  as (    )
选项：
A:
B:
C:
D:
答案: 【】

2、 问题:Which one of the below descriptions of the imaginary exponential signal  is NOT CORRECT (    )
选项：
A: Both the imaginary exponential siganl  and sine signal  are periodic signals with the fundamental peroid of  .
B:The imaginary exponential signal  can be represented as 
C:Both the imaginary exponential siganl  and sine signal  can be linearly represented by the other signal, and thus, they have the same properties.
D:The greater the , the higher the oscillation frequency of the real and imaginary parts of the imaginary exponential signal .
答案: 【The imaginary exponential signal  can be represented as 】

3、 问题:Given the waveform of a signal  , as shown below,  it can be represented as  (    )
选项：
A:
B:
C:
D:
答案: 【】

4、 问题: = (    )
选项：
A:
B:
C:
D:
答案: 【】

5、 问题:The value of the integral  is  (    )
选项：
A:0
B:4
C:-4
D:2
答案: 【0】

6、 问题:Which one of the below relations is WRONG (   ) ?
选项：
A:
B:
C:
D:
答案: 【】

7、 问题:Which one of the below descriptions of the imaginary exponential sequence  is WRONG (    )?
选项：
A:The imaginary exponential sequence  is not necessarily periodic.
B: The imaginary exponential sequence  and sinusoidal sequences can represent each other using the Euler’s relation.
C: The imaginary sequence  can be obtained by sampling from the continuous-time signal , therefore, they should have the same period.
D: The amplitude of the imaginary exponential sequence  may not increase as the angular frequency  increases.
答案: 【 The imaginary sequence  can be obtained by sampling from the continuous-time signal , therefore, they should have the same period.】

8、 问题:Which one of the below relations is WRONG (   ) ?
选项：
A:
B:
C:
D:
答案: 【】

9、 问题:Given the waveform of a signal   shown below, the signal can be represented by using  and  as (    )
选项：
A:
B:
C:
D:
答案: 【】

10、 问题:Given the waveform of a signal    shown below, the waveform of  should be (     )
选项：
A:
B:
C:
D:
答案: 【】

11、 问题:The waveform of a signal  is shown below.  What is the waveform of  (  )
选项：
A:
B:
C:
D:
答案: 【】

12、 问题:If , then =(    )
选项：
A: 
B: 
C:
D:
答案: 【】

13、 问题:Given the waveform of the signal  shown below, which one of the representation of is  WRONG (    )
选项：
A:
B:
C:
D:
答案: 【】

14、 问题:If a dicrete-time sequence , then which of the four expressions is NOT the even component of （  ）
选项：
A:
B:
C:
D:
答案: 【】

CHAPTER III – System Analysis in the Time Domain Test on Chapter 3

1、 问题:The waveform of a continuous-time signal is shown below. What frequency components does the signal have?
选项：