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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Theory of Machine
Oldham's coupling is the

Third inversion of double slider crank chain
Second inversion of double slider crank chain
Third inversion of slider crank chain
Second inversion of single slider crank chain

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