Theory of Machine
If some links are connected such that motion between them can take place in more than one direction, it is called

Successfully constrained motion
Partially constrained motion
Incompletely constrained motion
Completely constrained motion

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Theory of Machine
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then

Both open belt drive and crossed belt drive is recommended
Crossed belt drive is recommended
The drive is recommended depending upon the torque transmitted
Open belt drive is recommended

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