信号与系统（英文）(北京交通大学)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:2020-09-09到2020-12-20
更新状态:已完结

CHAPTER I – Course Overview Test on Chapter 1

1、 Which of the below deterministic signals is a continuous-time energy signal: ( ).‍

A:
B:
C:
D:
答案:

2、 Given a periodic continuous-time signal , what is the signal’s period and the average power ? ( )

A:
B:
C:
D:
答案:

3、 Given the below relationships between the voltage and the current, please pick the system that is time-variant ( ).

A:
B:
C:
D:
答案:

4、 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? ( )

A:
B:‍
C:
D:
答案:

5、 Given the relationship between the input , the output , and the initial state , which of the systems is a linear system? ( )

A:
B:
C:
D:
答案:

6、 Which of the below system is a time-invariant system? Given that or is the input of the system and or is the output. ( )

A:
B:
C:
D:
答案:

7、 Given the difference equation of a discrete-time system is , then the system is ( ).

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、 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 ? ( )

A:
B:,
C:,
D:,
答案: ,

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

1、 A sinusoidal signal can be represented by using imaginary exponential signal as ( )

A:
B:
C:
D:
答案:

2、 Which one of the below descriptions of the imaginary exponential signal is NOT CORRECT ( )

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、 Given the waveform of a signal , as shown below, it can be represented as ( )

A:
B:
C:
D:
答案:

4、 = ( )

A:
B:
C:
D:
答案:

5、 The value of the integral is ( )

A:0
B:4
C:-4
D:2
答案: 0

6、 Which one of the below relations is WRONG ( ) ?

A:
B:
C:
D:
答案:

7、 Which one of the below descriptions of the imaginary exponential sequence is WRONG ( )?

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、 Which one of the below relations is WRONG ( ) ?

A:
B:
C:
D:
答案:

9、 Given the waveform of a signal shown below, the signal can be represented by using and as ( )

A:
B:
C:
D:
答案:

10、 Given the waveform of a signal shown below, the waveform of should be ( )

A:
B:
C:
D:
答案:

11、 The waveform of a signal is shown below. What is the waveform of ( )

A:
B:
C:
D:
答案:

12、 If , then =( )

A:
B:
C:
D:
答案:

13、 Given the waveform of the signal shown below, which one of the representation of is WRONG ( )

A:
B:
C:
D:
答案:

14、 If a dicrete-time sequence , then which of the four expressions is NOT the even component of （ ）

A:
B:
C:
D:
答案:

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

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