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Nyquist Stability MCQs

Practice Nyquist Stability MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1
Control SystemsNyquist Stability

If an open-loop transfer function has no right-half-plane poles, closed-loop stability under the standard Nyquist criterion requires the Nyquist plot to have?

  • ANo encirclement of -1+j0
  • BOne clockwise encirclement of -1+j0
  • COne counterclockwise encirclement always
  • DAn encirclement of the origin
Report an error
Correct Answer: A. No encirclement of -1+j0
Explanation: When P=0, closed-loop stability requires Z=0; under the standard convention this means no net encirclement of the -1 point.
Reference: Standard control systems: nyquist stability
Question 2
Control SystemsNyquist Stability

The Nyquist plot is a mapping of a contour from the?

  • As-plane through the loop transfer function
  • BTime domain directly into the z-plane only
  • COutput plane into the input plane
  • DRoot locus into the Routh array
Report an error
Correct Answer: A. s-plane through the loop transfer function
Explanation: Nyquist analysis maps the Nyquist contour in the s-plane through the loop transfer function L(s)=G(s)H(s).
Reference: Standard control systems: nyquist stability