Theory of Machine
An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be an interference between the

Tip of the pinion and flank of gear
Tip of the gear tooth and flank of pinion
Flanks of both gear and pinion
Tip of both gear and pinion

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

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