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Chapter 1. Mathematical Model of Control System Chapter 1 test. Mathematical Model of Control System
1、 If the feed-forward transfer function of a system is G(s)，feedback block is H(s)，the system open-looptransfer function is
A:G(s)H(s)
B:G(s)
C:G(s)/(1+G(s)H(s))
D:G(s)/H(s)
答案: G(s)H(s)
2、 If the closed-loop transfer function of the unity-feedback control system is 
, then the open-loop transfer function of the system is
A:
B:
C:
D:
答案:
3、 Which one is correct about system transfer function?
A:Independent of the input signal and related to the system structure and parameters.
B:It is related to input signal and system structure and parameters.
C:Related to input signal, independent of system structure and parameters.
D:It has nothing to do with system structure and is related to system parameters.
答案: Independent of the input signal and related to the system structure and parameters.
4、 Transfer function is suitable for ( ) system.
A:Linear time-invariant system with single input and single output
B:Linear time-varying system with single input and single output
C:multiple input and multiple output
D:nonlinear system
答案: Linear time-invariant system with single input and single output
5、 For a LTI system, the unit-impulse response can be obtained by differentiating the corresponding response.
A:unit-step
B:unit-ramp
C:unit-parabolic
D:sinusoidal
答案: unit-step
6、 Obtain the transfer function of U0(s)/Ui(s)
A:
B:
C:
D:
答案:
7、 System dynamic structure block is shown as below，R(s)is input signal，N(s)is disturbance signal，obtain the transfer function of C(s)/R(s) 
A:(G1G2+G1G3(1+G2H))/(1+G2H+G1G2+G1G3+G1G2G3H)
B:(G1G2+G1G3(1+G2H))/(1+G2H+G1G2+G1G3)
C:(G1G2)/(1+G2H+G1G2+G1G3+G1G2G3H)
D:(G1G2+G1G3)/(1+G2H+G1G2+G1G3+G1G2G3H)
答案: (G1G2+G1G3(1+G2H))/(1+G2H+G1G2+G1G3+G1G2G3H)
8、 System dynamic structure block is shown as below，R(s)is input signal，N(s)is disturbance signal，obtain the transfer function of C(s)/N 
(s)
A:(-1-G2H+G1G2G4+G1G3G4(1+G2H))/(1+G2H+G1G2+G1G3+G1G2G3H)
B:(G1G2G4+G1G3G4(1+G2H))/(1+G2H+G1G2+G1G3)
C:(G1+G1G3G4(1+G2H))/(1+G2H+G1G2+G1G3)
D:(-1+G2H+G1G2+G1G3G4G2H)/(1+G2H+G1G2+G1G3)
答案: (-1-G2H+G1G2G4+G1G3G4(1+G2H))/(1+G2H+G1G2+G1G3+G1G2G3H)
9、 Closed-loop control system is an automatic control system. Open-loop control system is not an automatic control system.
A:正确
B:错误
答案: 错误
10、 The system 
is a system. (linear/nonlinear)
答案: linear
Chapter 2. Transient and Steady-State Response Analyses Chapter 2 test. Transient and Steady-State R
1、 The closed-loop transfer function of a second-order system is 
The step response of the system will
A:be a damped oscillation
B: oscillate to infinity
C:increase monotonically
D:decrease monotonically
答案: increase monotonically
2、 After the negative feedback connection is adopted, the
A:closed-loop system must be stable.
B:dynamic performance of the system will be improved.
C:steady-state error finally be eliminated completely.
D: structural parameters of the system need to be adjusted in order to improve the performance of the system.
答案: structural parameters of the system need to be adjusted in order to improve the performance of the system.
3、 The transfer function of a closed-loop system is G(s)=1/(s(s+1)) ，then the unit impulse response of the system is
A:
B:
C:
D:
答案:
4、 If the steady-state error of unity feedback control system to a ramp input is constant, then the system is a type system
A:0
B:I
C:II
D:III
答案: I
5、 
System dynamic structure block is shown in figure, （1） Determine the range of K for system stability.
A:0 0
6、 (2)Determine the range of K for the root of the system all on the left side of s=-1 in the s plane.
A:0.72 0.72
7、 (3)Determine the range of K for the steady-state error ess<=0.25 at input r(t)=2t+2.
A:8 8
8、 Given the transfer function G(s) of a system (3s+7)/(s(s+1)) A unit step u(t) is applied to the system’s input, then the time response y(t) is ( ).
A:y(t)= u(t) · (4+7t+4 e-t)
B:y(t)= u(t) · (2 + 7t + 7e-t)
C:y(t)= u(t) · (7 +4t + 4e-t)
D:y(t)= u(t) · (4 – 2t + e-t)
答案: y(t)= u(t) · (4+7t+4 e-t)
9、 The control system is shown in Figure a. When Gc(s)=0，(1)determine the 
, the damping ratio of the closed-loop system .
A:0.316
B:0.707
C:1
D:0.5
答案: 0.316
10、 (2) In Figure a, determine the undamped natural frequency 
of the closed-loop system.
A:3.16
B:2
C:2.73
D:1
答案: 3.16
11、 (3)In Figure a, determine the maximum overshoot of the closed-loop system .
A: 30%
B:10%
C:50%
D:9%
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