Theory of Machine
When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will

Oscillate with constant amplitude
Oscillate with increasing time period
Return to equilibrium position without oscillation
Oscillate with decreasing amplitude

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Theory of Machine
In gears, interference takes place when

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

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