1.

The controlling force curves F, D, and B for a spring-controlled governor are shown in the figure, where r1 and r2 are any two radii of rotation.The characteristics shown by the curves are

A. F - Stable; D - Isochronous; B - Unstable
B. F - Stable; D - Unstable; B - Isochronous
C. F - Unstable; D - Stable; B - Isochronous
D. F - Unstable; D - Isochronous; B - Stable
Answer» E.


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