Machine Design
The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensile or compressive) is called

Fluctuating stress
Yield stress
Repeated stress
Alternating stress

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Machine Design
Stress concentration is caused due to

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

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