Theory of Machine
A system in dynamic balance implies that

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

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Theory of Machine
In gears, interference takes place when

The tip of a tooth of a mating gear digs into the portion between base and root circles
Pitch of the gears is not same
Gears do not move smoothly in the absence of lubrication
Gear teeth are undercut

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