Machine Design
Factor of safety for fatigue loading is the ratio of

Young's modulus to the ultimate tensile strength
Endurance limit to the working stress
Elastic limit to the yield point
Elastic limit to the working stress

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Machine Design
Stress concentration is caused due to

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

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