Theory of Machine
A kinematic chain requires at least

5 links and 4 turning pairs
2 links and 3 turning pairs
3 links and 4 turning pairs
4 links and 4 turning pairs

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Theory of Machine
The maximum fluctuation of speed is the

Variations of speed above and below the mean resisting torque line
Difference of the maximum and minimum speeds
Sum of maximum and minimum speeds
Difference of minimum fluctuation of speed and the mean speed

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