Theory of Machine
The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as

Logarithmic decrement
Damping coefficient
Magnification factor
Damping factor

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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
None of the listed here
Vary with the configuration of the mechanism
Remain in the same place for all configurations of the mechanism

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