Theory of Machine
Instantaneous center of rotation of a link in a four bar mechanism lies on

Can’t occur
Left side pivot of this link
Right side pivot of this link
A point obtained by intersection on extending adjoining links

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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
A body vibrates under the influence of external force
No external force acts on a body, after giving it an initial displacement
None of these

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