大学MOOC 控制原理(北京交通大学)1461172175 最新慕课完整章节测试答案
Frequency Response Methods
文章目录
第5单元测验
1、单选题：
Consider the stable system represented by the transfer function 
.
When the input r(t)=sin3t, the phase lag for this system is ( ).
选项：
A: 
B: 
C: 
D: 
答案: 【 】
2、单选题：
Consider a feedback control system with the following open-loop transfer function
The break frequencies on the open-loop Bode plot are ( ).
选项：
A: 
B: 
C: 
D: 
答案: 【 】
3、单选题：
For a type 1 system, the low-frequency asymptote is a straight-line with a slope of ( ).
选项：
A: 0dB/dec
B: -20dB/dec
C: -40dB/dec
D: +20dB/dec
答案: 【 -20dB/dec】
4、单选题：
For a type 0 system, the low-frequency asymptote is a straight-line with a slope of ( ).
选项：
A: 0dB/dec
B: 20dB/dec
C: -20dB/dec
D: -40dB/dec
答案: 【 0dB/dec】
5、单选题：
The transfer function G(s) of a system is
For the sinusoidal input r(t)=3sin2t, the steady-state output is equal to ( ).
选项：
A: 
B: 
C: 
D: 
答案: 【 】
6、单选题：
The corner frequency (break frequency) of the following first-order factor is ( ).
选项：
A: 1
B: 2
C: 0.5
D: 4
答案: 【 2】
7、判断题：
For type 0 system, the starting point of the polar plot is finite and is on the positive real axis.
选项：
A: 正确
B: 错误
答案: 【 正确】
8、判断题：
The type of the system determines the slope of the log-magnitude curve at low frequencies.
选项：
A: 正确
B: 错误
答案: 【 正确】
9、判断题：
The phase angle of integral factor is constant and equal to 
.
选项：
A: 正确
B: 错误
答案: 【 错误】
10、判断题：
The phase angle of derivative factor is constant and equal to 
.
选项：
A: 正确
B: 错误
答案: 【 正确】
11、判断题：
For a minimum-phase system, both the phase and gain margins must be positive for the system to be stable.
选项：
A: 正确
B: 错误
答案: 【 正确】
Introduction to Control Systems
第1单元测验
1、单选题：
A open-loop control system utilizes an actuating device to control a process ( ).
选项：
A: without using feedback
B: using feedback
C: in engineering design
D: in engineering synthesis
答案: 【 without using feedback】
2、多选题：
Important modern applications of control systems include which of the following? ( )
选项：
A: Safe automobiles
B: Autonomous robots
C: Automated manufacturing
D: Biomedical engineering
答案: 【 Safe automobiles;
Autonomous robots;
Automated manufacturing;
Biomedical engineering】
3、多选题：
The following systems belong to the open-loop control are ( ).
选项：
A: washing machine
B: water-level automatic control system
C: traffic control by means of signal operated on a time basis
D: Watt's flyball governor
答案: 【 washing machine;
traffic control by means of signal operated on a time basis】
4、多选题：
The basic requirements for automatic control systems include ( ).
选项：
A: stability
B: rapidity
C: accuracy
D: robust
答案: 【 stability;
rapidity;
accuracy】
5、多选题：
Closed-loop control systems should have which of the following properties: ( )
选项：
A: Good regulation against disturbances
B: Desirable responses to commands
C: Low sensitivity to changes in the plant parameters
D: Stable
答案: 【 Good regulation against disturbances;
Desirable responses to commands;
Low sensitivity to changes in the plant parameters;
Stable】
6、判断题：
A system is called linear if the principle of s