Theory of Machine
When the particles of a body moves perpendicular to its axis, then the body is said to have

Transverse vibration
Longitudinal vibration
None of these
Torsional vibration

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

Through which the cam rotates during the period in which the follower remains in the highest position
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
Of rotation of the cam for a definite displacement of the follower

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