Theory of Machine
The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)

μ W R
(3/4) μ W R
(2/3) μ W R
(1/2) μ W R

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Theory of Machine
In a single slider crank chain

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

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