Theory of Machine
The mechanism consisting of three turning pairs and one sliding pair, is called a

Whitworth quick return motion mechanism
Single slider crank chain
Crank and slotted lever quick return motion mechanism
All of these

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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

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

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