Theory of Machine
Balancing of rotating and reciprocating parts of an engine is necessary when it runs at

Any one of these
Slow speed
Moderate speed
Highs peed

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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

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

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