Theory of Machine
The example of completely constrained motion is a

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

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Theory of Machine
Which of the following statement is correct for involute gears?

A convex flank is always in contact with concave flank.
The interference is inherently absent.
The pressure angle is constant throughout the teeth engagement.
The variation in centre distance of shafts increases radial force.

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