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

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

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

Of rotation of the cam for definite displacement of the follower
During which the follower returns to its initial position
Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
Through which the cam rotates during the period in which the follower remains in the highest position

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