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

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

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

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

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