Theory of Machine
The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in

Longitudinal vibrations
All of these
Torsional vibrations
Transverse vibrations

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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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