Question: The polar plot of a type - 1, 3-pole, stable open-loop system is shown below. The closedloop system is (a) always stable (b) marginally stable

The polar plot of a type - 1, 3-pole, stable open-loop system is shown below. The closedloop system is

- 1.42 @=0 GH plane 3

(a) always stable
(b) marginally stable
(c) unstable with one pole on the right half s-plane
(d) unstable with two poles on the right half s-plane.

- 1.42 @=0 GH plane 3

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