Machine Design
In radial cams, the follower moves

In a direction perpendicular to the cam axis
Along the cam axis
In a direction parallel to the cam axis
In any direction irrespective of cam axis

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Machine Design
An open belt drive is used when

Shafts are arranged parallel and rotate in the opposite directions
Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the same directions
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft

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