Theory of Machine
Two systems shall be dynamically equivalent when

All of these
The mass of two are same
M.I. of two about an axis through e.g. is equal
G. of two coincides

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

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