Machine Design
A sliding bearing which operates without any lubricant present, is called

Hydrostatic lubricated bearing
Hydrodynamic lubricated bearing
Boundary lubricated bearing
Zero film bearing

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Machine Design
The fatigue stress concentration factor is defined as

All of these
The ratio of endurance limit without stress concentration to the endurance limit with stress concentration
The ratio of endurance limit with stress concentration to the endurance limit without stress concentration
The product of the endurance limits with and without stress concentration

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