Theory of Machine
The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the

Pitch curve
Base circle
Prime circle
Pitch circle

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Theory of Machine
Effort of a governor is the

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

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