Theory of Machine
In an open pair, the two elements of a pair

Are not held together mechanically
Have a line or point contact when in motion
Have a surface contact when in motion
Are kept in contact by the action of external forces, when in motion

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Theory of Machine
Effort of a governor is the

Mean force exerted at the sleeve for maximum equilibrium speed
Work-done at the sleeve for maximum equilibrium speed
Mean force exerted at the sleeve for a given percentage change of speed
None of these

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