Theory of Machine
The example of completely constrained motion is a

Motion of a piston in the cylinder of a steam engine
Motion of a square bar in a square hole
All of these
Motion of a shaft with collars at each end in a circular hole

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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
Oscillate with decreasing amplitude
Return to equilibrium position without oscillation

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Theory of Machine
In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the steam lap and the angle of advance of the eccentric but keeping constant the travel and lead of the valve, this method will

Reduce maximum opening of port to steam
Cause withdrawing or throttling of steam
Reduce length of effective stroke of piston
All of the listed here

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