Machine Design
In a hydrodynamic lubricated bearing

The lubricant is forced between the journal and the bearing, by external pressure
There is a thin film of lubricant between the journal and the bearing
There is a thick film of lubricant between the journal and the bearing
There is no lubricant between the journal and the bearing

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Machine Design
According to Rankine's theory, the failure occurs at a point in a member

When the strain energy per unit volume in a biaxial stress system reaches the strain energy at the elastic limit per unit volume as determined from a simple tension test
When the maximum shear stress in a biaxial stress system reaches the shear stress at elastic limit in a simple tension test
When the maximum principal stress in a biaxial stress system reaches the elastic limit of the material in a simple tension test
When the maximum principal strain in a biaxial stress system reaches the strain at the elastic limit as determined from a simple tension test

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