Theory of Machine
A spring controlled governor is said to be unstable when the controlling force

Increases as the radius of rotation increases
Decreases as the radius of rotation increases
Remains constant for all radii of rotation
Increases as the radius of rotation decreases

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Theory of Machine
The relation l = (2/3).(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to

Two lower pairs and one additional link
Two lower pairs and two additional links
One lower pair and two additional links
Any one of these

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