Machine Design
An alien bolt is

Used in high speed components
Provided with hexagonal depression in head
Self locking bolt
Same as stud

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Machine Design
Which is correct statement? Stress concentration in cyclic loading is

Very serious in brittle materials and less serious in ductile materials
Equally serious in both types of materials
Very serious in ductile materials and less serious in brittle materials
Seriousness would depend on other factors

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