Theory of Machine
In a kinematic chain, a quaternary joint is equivalent to

Three binary joints
One binary joint
Four binary joints
Two binary joints

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Theory of Machine
Sensitiveness of the governor is defined as the ratio of the

Sum of the maximum and minimum equilibrium speeds to the mean speed
Mean speed to the minimum equilibrium speed
Mean speed to the maximum equilibrium speed
Difference of the maximum and minimum equilibrium speeds to the mean speed

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