Theory of Machine
Lower pairs are those which have

Two elements that permit relative motion
Point or line contact between the two elements when in motion
Elements of pairs not held together mechanically
Surface contact between the two elements when in motion

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Theory of Machine
Power of a governor is the

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
Mean force exerted at the sleeve for maximum equilibrium speed

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