Theory of Machine
For the same lift and same angle of ascent, a smaller base circle will give

There is no such relation with pressure angle
A small value of pressure angle
A large value of pressure angle
Something else

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Theory of Machine
The contact ratio is given by

(Length of the path of approach)/(Circular pitch)
(Length of path of recess)/(Circular pitch)
(Length of the arc of approach)/cosφ
(Length of the arc of contact)/(Circular pitch)

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