Theory of Machine
The effort of a Porter governor is equal to (where c = Percentage increase in speed, m = Mass of ball, and M = Mass on the sleeve)

c (m - M) g
c (m + M) g
c/(m + M) g
c/(m - M) g

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Theory of Machine
In a single slider crank chain

One is a turning pair and three are sliding pairs
Three are turning pairs and one is a sliding pair
Two are turning pairs and two are sliding pairs
Each of the four pairs is a turning pair

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