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

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

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Machine Design
In hydrodynamic bearings

Do not require external supply of lubricant
The oil film is maintained by supplying oil under pressure
Grease is used for lubrication
The oil film pressure is generated only by the rotation of the journal

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