A loop transfer function has stability margin s_m = 0.4. Which one of the following statements is true?

A negative feedback system has loop transfer function KL(s) for some constant K. The function L has two poles in the right-half plane. The Nyquist plot of L is shown below (i.e. in this case K = 1).

For which of the following values of K is the closed-loop system stable?

A loop transfer function with no right-half plane poles has Nyquist plot:

True of False? The closed loop system is stable.

A system has Bode plot shown below:

Which of the following inputs is amplified by the system?

Which of the gang of four would you use to understand the effect that a sudden change in the reference input would have on the output of the controller (in the feedback system shown below, assuming F(s)=1)?

The following plot shows how the four states of the system evolve over time, but the states are

labelled A, B, C, D. Match the labels A, B, C, D, to the state variables (position, angular position,

linear velocity, and angular velocity).

Which of the following statements is correct about the system response?