Theory of Machine
The method of direct and reverse cranks is used in engines for

Kinematic analysis
Vibration analysis
The control of speed fluctuations
Balancing of forces and couples

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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
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

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