Theory of Machine
If the controlling force line for a spring controlled governor when produced intersects the Y-axis at the origin, then the governor is said to be

Unstable
None of the listed here
Stable
Isochronous

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Theory of Machine
A system of masses rotating in different parallel planes is in dynamic balance if the

Resultant force is equal to zero
Resultant force and resultant couple are both equal to zero
Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero
Resultant couple is equal to zero

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