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

Reduce vibration
Reduce slip
Ensure proper alignment
Ensure uniform loading

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

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