Theory of Machine
The example of successfully constrained motion is a

All of these
Motion of the shaft between a footstep bearing
Motion of an I.C. engine valve
Piston reciprocating inside an engine cylinder

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

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

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