Theory of Machine
The working depth of a gear is the radial distance from the

Top of a tooth to the bottom of a tooth
Addendum circle to the clearance circle
Pitch circle to the top of a tooth
Pitch circle to the bottom of a tooth

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Theory of Machine
Oldham's coupling is the

Third inversion of slider crank chain
Second inversion of single slider crank chain
Second inversion of double slider crank chain
Third inversion of double slider crank chain

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

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