Theory of Machine
A kinematic chain is known as a mechanism when

None of the links is fixed
None of these
Two of the links are fixed
One of the links is fixed

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Theory of Machine
The relation l = (2/3).(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to

Two lower pairs and two additional links
Any one of these
One lower pair and two additional links
Two lower pairs and one additional link

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