Question: The Bode diagram of the forward - path transfer function of a unity - feedback control system is obtained experimentally when the forward gain is

The Bode diagram of the forward-path transfer function of a unity-feedback control system is obtained experimentally when the forward gain is fixed to certain value K .
a) Find the gain and phase margin of the system from the diagram the best you can read.
Is the system stable or unstable? Justify your answer. (25%)
b) Find out how much the gain must be changed from its original value for having a marginally stable system. (25%)
Show the results on the Bode plot.
The Bode diagram of the forward - path transfer

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