Theory of Machine
Oldham’s coupling is an inversion of the kinematic chain used in

Rotary engine
Universal joint
Elliptical trammels
Whitworth quick return mechanism

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Theory of Machine
A governor is said to be stable, if the

Radius of rotation of balls decreases as the equilibrium speed decreases
Radius of rotation of balls increases as the equilibrium speed decreases
Radius of rotation of balls decreases as the equilibrium speed increases
Radius of rotation of balls increases as the equilibrium speed increases

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