Theory of Machine
When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be

Stable
Unstable
None of these
Isochronous

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Theory of Machine
Crowning on pulleys helps

Increase belt and pulley life
In decreasing the slip of the belt
For automatic adjustment of belt position so that belt runs centrally
In increasing velocity ratio

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