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
Oscillate with constant amplitude
Return to equilibrium position without oscillation

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Theory of Machine
In a hydrodynamic journal bearing, there is

A very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing
A forced lubricant between the journal and the bearing
No lubricant between the journal and the bearing
A thick film of lubricant between the journal and the bearing

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