Machine Design
Stress concentration is caused due to

Pitting at points or areas at which loads on a member are applied
All of these
Abrupt change of section
Variation in properties of material from point to point in a member

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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
The elasticity is the property of a material which enables it to

Retain deformation produced under load permanently
Resists fracture due to high impact loads
Regains its original shape after deformation when the external forces are removed
Draw into wires by the application of a tensile force

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