Theory of Machine
The Scott-Russell mechanism consists of

Sliding and turning pairs
Sliding pairs only
Sliding and rotary pairs
Turning and rotary pairs

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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
Open belt drive is recommended
Both open belt drive and crossed belt drive is recommended

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