Theory of Machine
It is required to connect two parallel shafts, the distance between whose axes is small and variable. The shafts are coupled by

Oldham's coupling
Universal joint
Flexible coupling
Knuckle joint

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

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