Theory of Machine
The maximum fluctuation of energy is the

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

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Theory of Machine
Kinematic pairs are those which have

Point or line contact between the two elements when in motion
Two elements that permit relative motion
Surface contact between the two elements when in motion
Elements of pairs not held together mechanically

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