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

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

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Theory of Machine
The maximum fluctuation of energy is the

Ratio of the mean resisting torque to the work-done per cycle
Sum of the maximum and minimum energies
Variations of energy above and below the mean resisting torque line
Difference between the maximum and minimum energies

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