15679. A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when

a is + ve and b = 0
a = 0 and b is + ve
a is + ve and b is – ve
a is + ve and b is als
✅ The correct answer is option A.

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