Theory of Machine
When the nature of contact between the elements of a pair is such that it can only slide relative to the other, the pair is known as a

Sliding pair
Spherical pair
Turning pair
Screw pair

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

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