Theory of Machine
The Scott-Russell mechanism consists of

Sliding and rotary pairs
Turning and rotary pairs
Sliding pairs only
Sliding and turning pairs

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Theory of Machine
A governor is said to be stable, if the

Radius of rotation of balls decreases as the equilibrium speed increases
Radius of rotation of balls decreases as the equilibrium speed decreases
Radius of rotation of balls increases as the equilibrium speed increases
Radius of rotation of balls increases as the equilibrium speed decreases

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