Theory of Machine
A system in dynamic balance implies that

There will absolutely no wear of bearings
The system is also statically balanced
There is no critical speed in the system
The system is critically damped

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Theory of Machine
The inversion of a mechanism is

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

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