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mechanical engineering theory of machines
1. 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): a = 0 and b is + ve
(B): a is + ve and b = 0
(C): a is + ve and b is - ve
(D): a is + ve and b is also + ve
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