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

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

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Theory of Machine
Angle of action of cam is defined as the angle

Through which the cam rotates during the period in which the follower remains in the highest position
Of rotation of the cam for a definite displacement of the follower
Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
Moved by the cam from beginning of ascent to the termination of descent

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