Theory of Machine
The inversion of a mechanism is

Changing of a higher pair to a lower pair
Obtained by reversing the input and output motion
Obtained by fixing different links in a kinematic chain
Turning its upside down

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

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