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

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

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Theory of Machine
Higher pairs are those which have

Point or line contact between the two elements when in motion
Two elements that permit relative motion
Surface contact between the two elements when in motion
Elements of pairs not held together mechanically

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