Theory of Machine
Length of arc of contact is given by

Arc of approach + Arc of recess
Arc of approach / Arc of recess
Arc of approach × Arc of recess
Arc of approach - Arc of recess

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Theory of Machine
Power of a governor is the

Mean force exerted at the sleeve for a given percentage change of speed
Mean force exerted at the sleeve for maximum equilibrium speed
Work-done at the sleeve for maximum equilibrium speed
None of these

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