Theory of Machine
The example of completely constrained motion is a

Motion of a square bar in a square hole
All of these
Motion of a shaft with collars at each end in a circular hole
Motion of a piston in the cylinder of a steam engine

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Theory of Machine
The contact ratio is given by

(Length of the arc of contact)/(Circular pitch)
(Length of the arc of approach)/cosφ
(Length of path of recess)/(Circular pitch)
(Length of the path of approach)/(Circular pitch)

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

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

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