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As the polar plot moves toward the point (-1, 0) then the system becomes :

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in Control Systems by (105k points)
As the polar plot moves toward the point (-1, 0) then the system becomes :

(a) Stable

(b) Marginally stable

(c) Conditionally stable

(d) Unstable

This question was addressed to me in final exam.

My enquiry is from Assessment of Relative Stability Using Nyquist Criterion topic in section Stability in Frequency Domain of Control Systems

1 Answer

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Best answer
Right choice is (d) Unstable

The explanation: As the polar plot moves toward the point (-1, 0) then the system becomes unstable.

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