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

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

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Machine Design
A bolt of uniform strength can be developed by

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

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