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

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

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Theory of Machine
Lower pairs are those which have

Two elements that permit relative motion
Point or line contact between the two elements when in motion
Surface contact between the two elements when in motion
Elements of pairs not held together mechanically

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