Theory of Machine
In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links

Will remain same
Will change
Could change or remain unaltered depending on which link is fixed
Will not occur

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Theory of Machine
Oldham's coupling is the

Third inversion of double slider crank chain
Third inversion of slider crank chain
Second inversion of double slider crank chain
Second inversion of single slider crank chain

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