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
Inertia force acts

Perpendicular to the acceleration force
None of the listed here
Opposite to the direction of acceleration force
Along the direction of acceleration force

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