Theory of Machine
The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as

Turning pair
Sliding pair
Spherical pair
Rolling 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

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

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