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

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

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Theory of Machine
The inversion of a mechanism is

Changing of a higher pair to a lower pair
Turning its upside down
Obtained by fixing different links in a kinematic chain
Obtained by reversing the input and output motion

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