Theory of Machine
When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a

Lower pair
Self-closed pair
Force-closed pair
Higher pair

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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

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

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