Theory of Machine
A completely constrained motion can be transmitted with.

1 link with pin joints
2 links with pin joints
4 links with pin joints
3 links with pin joints

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

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
There is a reduction in amplitude after every cycle of vibration

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