Theory of Machine
A spring controlled governor is said to be stable if the controlling force line when produced intersects the Y-axis

Above the origin
Below the origin
Any one of these
At the origin

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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 decreasing amplitude
Return to equilibrium position without oscillation
Oscillate with constant amplitude

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