Theory of Machine
A spring controlled governor is found unstable. It can be made stable by

Decreasing the ball mass
Decreasing the spring stiffness
Increasing the ball mass
Increasing the spring stiffness

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Theory of Machine
In a single slider crank chain

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

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