Theory of Machine
The partial balancing means

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

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Theory of Machine
A body is said to be under forced vibrations, when

None of these
No external force acts on a body, after giving it an initial displacement
There is a reduction in amplitude after every cycle of vibration
A body vibrates under the influence of external force

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