Theory of Machine
If some links are connected such that motion between them can take place in more than one direction, it is called

Successfully constrained motion
Partially constrained motion
Incompletely constrained motion
Completely constrained motion

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

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

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