Theory of Machine
The instantaneous centers which vary with the configuration of mechanism are called

Fixed instantaneous centers
Permanent instantaneous centers
Neither fixed nor permanent instantaneous centers
None of these

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Theory of Machine
When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will

Oscillate with decreasing amplitude
Oscillate with increasing time period
Return to equilibrium position without oscillation
Oscillate with constant amplitude

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