Theory of Machine
The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is

Oldham's coupling
Flexible coupling
Universal coupling
Chain coupling

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

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

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