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What is the significance of the Nyquist plot in control systems?

Practice Questions

Q1
What is the significance of the Nyquist plot in control systems?
  1. It shows the time response of a system.
  2. It helps in determining the stability of a system in the frequency domain.
  3. It is used for root locus analysis.
  4. It provides the transfer function of a system.

Questions & Step-by-Step Solutions

What is the significance of the Nyquist plot in control systems?
  • Step 1: Understand that a Nyquist plot is a graph that shows how a control system responds to different frequencies of input signals.
  • Step 2: Learn that the plot is created by plotting the system's response (gain and phase) as a curve in a complex plane.
  • Step 3: Recognize that the critical point on the plot is the point (-1, 0) in the complex plane, which indicates instability.
  • Step 4: Analyze the number of times the Nyquist plot encircles the critical point to determine the stability of the system.
  • Step 5: Conclude that if the plot encircles the critical point in a certain way, it indicates whether the system is stable or unstable.
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