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

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

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Theory of Machine
For dynamic balancing of a shaft

The net couple due to the dynamic forces acting on the shaft is equal to zero
None of these
Both (A) and (B)
The net dynamic force acting on the shaft is equal to zero

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