Theory of Machine
Longitudinal vibrations are said to occur when the particles of a body moves

Perpendicular to its axis
Parallel to its axis
None of these
In a circle about its axis

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Theory of Machine
In a four bar chain or quadric cycle chain

One is a turning pair and three are sliding pairs
Two are turning pairs and two are sliding pairs
Three are turning pairs and one is a sliding pair
Each of the four pairs is a turning pair

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