Machine Design
The flank of the tooth is the

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

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Machine Design
A bolt of uniform strength can be developed by

Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt
None of these
Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt
Keeping the core diameter smaller than the diameter of the unthreaded portion

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