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

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

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Machine Design
The fatigue stress concentration factor is defined as

The ratio of endurance limit without stress concentration to the endurance limit with stress concentration
The product of the endurance limits with and without stress concentration
All of these
The ratio of endurance limit with stress concentration to the endurance limit without stress concentration

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