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

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

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Theory of Machine
Pitch point on a cam is

The point on cam pitch curve having the minimum pressure angle
Any point on pitch circle
The point on cam pitch curve having the maximum pressure angle
Any point on pitch curve

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