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 uniform loading
Reduce slip
Reduce vibration
Ensure proper alignment

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

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