Theory of Machine
The example of completely constrained motion is a

All of these
Motion of a piston in the cylinder of a steam engine
Motion of a square bar in a square hole
Motion of a shaft with collars at each end in a circular hole

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Theory of Machine
In elliptical trammels

Three pairs turning and one pair sliding
One pair turning and three pairs sliding
Two pairs turning and two pairs sliding
All four pairs are turning

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