Machine Design
In nitrated parts, the origins of the fatigue cracks will occur at

Just below the surface
None of these
Within the core
Surface

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Machine Design
Which is correct statement? Stress concentration in static 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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