Crey | The controlling force curves P, Q and R for a spring controlled governor are shown in the figure, where 𝒓𝟏 and 𝒓𝟐 are any two radii of rotation. The characteristics shown by the curves are P – Unstable; Q – Stable; R – Isochronous , P – Unstable; Q – Isochronous; R – Stable , P– Stable; Q – Isochronous; R – Unstable , P – Stable; Q – Unstable; R

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The controlling force curves P, Q and R for a spring controlled governor are shown in the figure, where 𝒓𝟏 and 𝒓𝟐 are any two radii of rotation.

The characteristics shown by the curves are

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