Theory of Machine
If the controlling force line for a spring controlled governor when produced intersects the Y-axis at the origin, then the governor is said to be

Stable
Unstable
None of the listed here
Isochronous

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Theory of Machine
The contact ratio is given by

(Length of the arc of contact)/(Circular pitch)
(Length of the path of approach)/(Circular pitch)
(Length of path of recess)/(Circular pitch)
(Length of the arc of approach)/cosφ

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