Machine Design
Surface endurance limit of gear material is dependent upon its

Toughness
Elastic strength
Brinell hardness number
Yield strength

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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
Seriousness would depend on other factors
Very serious in ductile materials and less serious in brittle 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
The oil film pressure is generated only by the rotation of the journal
Grease is used for lubrication

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