Theory of Machine
In elliptical trammels

Two pairs turning and two pairs sliding
One pair turning and three pairs sliding
All four pairs are turning
Three pairs turning and one pair sliding

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

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

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