Theory of Machine
The maximum fluctuation of energy is the

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

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

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

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