Theory of Machine
An imaginary circle which by pure rolling action, gives the same motion as the actual gear, is called

Clearance circle
Dedendum circle
Pitch circle
Addendum 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
Sum of the maximum and minimum equilibrium speeds to the mean speed
Mean speed to the maximum equilibrium speed

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