Theory of Machine
A circle passing through the pitch point with its center at the center of cam axis is known as

Base circle
Pitch circle
Prime circle
Outer circle

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

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

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