Machine Design
The plasticity is the property of a material which enables it to

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

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Machine Design
The fatigue stress concentration factor is defined as

The ratio of endurance limit with stress concentration to the endurance limit without stress concentration
The ratio of endurance limit without stress concentration to the endurance limit with stress concentration
The product of the endurance limits with and without stress concentration
All of these

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Machine Design
In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that

The effect of curvature of the cylinder wall is neglected
The effect of the restraining action of the heads at the end of the pressure vessel is neglected
All of these
The tensile stresses are uniformly distributed over the section of the walls

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