Theory of Machine
A spring controlled governor is said to be isochronous when the controlling force

Increases as the radius of rotation increases
Increases as the radius of rotation decreases
Remain constant for all radii of rotation
Decreases as the radius of rotation increases

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Theory of Machine
Oldham's coupling is the

Second inversion of double slider crank chain
Third inversion of slider crank chain
Third inversion of double slider crank chain
Second inversion of single slider crank chain

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