Machine Design
The expression 0.175 - 0.841/T is the Lewis form factor for

20° full depth involute system
14½° composite and full depth involute system
20° stub system
None of these

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Machine Design
The flank of the tooth is the

Surface of the tooth below the pitch surface
Surface of the tooth above the pitch surface
Surface of the top of the tooth
Width of the tooth measured along the pitch circle

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