Machine Design
In static loading, stress concentration is more serious in

Elastic materials
Ductile materials
Brittle materials
Brittle as well as ductile materials

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Machine Design
A bolt of uniform strength can be developed by

Keeping the core diameter smaller than the diameter of the unthreaded portion
None of these
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

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