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

Within the core
Surface
Just below the surface
None of these

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Machine Design
In oilness bearings

The oil film is maintained by supplying oil under pressure
Do not require external supply of lubricant
Grease required to be applied after some intervals
The oil film pressure is generated only by the rotation of the journal

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Machine Design
Which is correct statement?

A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel
Both will be equally rigid
Which one is rigid will depend on several other factors
A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron

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