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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.

1. P – Stable; Q – Isochronous; R – Unstable
2. P – Isochronous; Q – Stable; R – Unstable
3. P – Stable; Q – Isochronous; R – Unstable
4. P – Stable; Q – Unstable; R – Isochronous

Correct answer: P – Stable; Q – Isochronous; R – Unstable

Solution

Option A is correct because the characteristics of the curves indicate that curve P maintains stability at varying speeds, curve Q achieves constant speed regardless of load (isochronous), and curve R shows instability as the radius of rotation increases.

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