Theory of Machine
When the nature of contact between the elements of a pair is such that it can only slide relative to the other, the pair is known as a

Screw pair
Sliding pair
Turning pair
Spherical pair

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

None of these
No external force acts on a body, after giving it an initial displacement
A body vibrates under the influence of external force
There is a reduction in amplitude after every cycle of vibration

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Theory of Machine
Oldham's coupling is the

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

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