Theory of Machine
In higher pair, the relative motion is

Purely rotary
Purely turning
Purely sliding
Combination of sliding and turning

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

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Theory of Machine
In a four bar chain or quadric cycle chain

Two are turning pairs and two are sliding pairs
One is a turning pair and three are sliding pairs
Each of the four pairs is a turning pair
Three are turning pairs and one is a sliding pair

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