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

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

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Theory of Machine
In a single slider crank chain

Three are turning pairs and one is a sliding pair
Each of the four pairs is a turning pair
One is a turning pair and three are sliding pairs
Two are turning pairs and two are sliding pairs

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Theory of Machine
In gears, interference takes place when

Gear teeth are undercut
Gears do not move smoothly in the absence of lubrication
The tip of a tooth of a mating gear digs into the portion between base and root circles
Pitch of the gears is not same

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