Machine Design
Lewis form factor for 14½° composite and full depth involute system is (where T = Number of teeth)

None of these
0.124 - (0.684/T)
0.175 - (0.841/T)
0.154 - (0.912/T)

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Machine Design
The contact ratio is the ratio of

Length of arc of recess to the circular pitch
Length of arc of contact to the circular pitch
Length of path of contact to the circular pitch
Length of arc of approach to the circular pitch

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