Theory of Machine
A combination of kinematic pairs, joined in such a way that the relative motion between the links is completely constrained, is called a

Mechanism
Structure
Inversion
Kinematic chain

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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
None of these
A body vibrates under the influence of external force
There is a reduction in amplitude after every cycle of vibration

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