Theory of Machine
Critical damping is a function of

Damping coefficient and natural frequency
Mass and stiffness
Mass and damping coefficient
Mass and natural frequency

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Theory of Machine
In gears, interference takes place when

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

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