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

None of these
14½° composite and full depth involute system
20° stub system
20° full depth involute 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
None of these
Keeping the core diameter smaller than the diameter of the unthreaded portion
Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt

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Machine Design
An open belt drive is used when

Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the same directions
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Shafts are arranged parallel and rotate in the opposite directions

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