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

In a circle about its axis
Perpendicular to its axis
None of these
Parallel 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
Through which the cam rotates during the period in which the follower remains in the highest position
Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
During which the follower returns to its initial position

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