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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Theory of Machine
In a four bar chain or quadric cycle chain

Three are turning pairs and one is a sliding pair
Each of the four pairs is a turning pair
Two are turning pairs and two are sliding pairs
One is a turning pair and three are sliding pairs

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