Theory of Machine
In a steam engine, the link constitutes a

Crank pin, crankshaft and flywheel
All of these
Connecting rod with big and small end brasses, caps and bolts
Piston, piston rod and cross-head

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

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