Theory of Machine
The partial balancing means

Balancing partially revolving masses
Best balancing of engines
All of these
Balancing partially reciprocating masses

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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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