Theory of Machine
The maximum fluctuation of energy is the

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

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Theory of Machine
The inversion of a mechanism is

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

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