Theory of Machine
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set to

Ensure proper alignment
Reduce slip
Ensure uniform loading
Reduce vibration

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

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