Theory of Machine
When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as

Torsional pendulum
Compound pendulum
Second's pendulum
Simple pendulum

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Theory of Machine
Oldham's coupling is the

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

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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

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

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