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

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

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Theory of Machine
In a mechanism, the fixed instantaneous centers are those centers which

None of the listed here
Vary with the configuration of the mechanism
Remain in the same place for all configurations of the mechanism
Moves as the mechanism moves, but joints are of permanent nature

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