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

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

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Theory of Machine
Inertia force acts

Perpendicular to the acceleration force
None of the listed here
Opposite to the direction of acceleration force
Along the direction of acceleration force

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