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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Theory of Machine
Inertia force acts

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

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