Which of the following statement is incorrect for root locus technique?

Which of the following statement is incorrect for root locus technique? Correct Answer None of these

Root locus Technique:

• This is a technique used as a stability criterion in the field of classical control theory developed by Walter R. Evans which can determine the stability of the system.
• In the root locus diagram, we can observe the path of the closed-loop poles. Hence, we can identify the nature of the control system.
• In this technique, we will use an open-loop transfer function to know the stability of the closed-loop control system.
• This method is a graphical technique that gives the position of the roots of the characteristic equation i.e. the position of closed-loop poles as the gain K is varied. The root locus diagram is plotted by using the open-loop poles but not the closed-loop poles.
• This method is very much useful because it shows graphically the extremes of the circuit and helps to define regions of stability for gain in the range between K＝0 and K = ∞.
• It is the most useful for single-output systems.
• It is used to obtain closed-loop pole configuration from open-loop poles and zeros.