Theory of Machine
When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a

Higher pair
Self-closed pair
Lower pair
Force-closed pair

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Theory of Machine
Effort of a governor is the

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

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