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
Angle of ascent of cam is defined as the angle

Through which the cam rotates during the period in which the follower remains in highest position
Of rotation of the cam for a definite displacement of the follower
During which the follower returns to its initial position
Moved by the cam from the instant the follower begins to rise, till it reaches its highest position

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