Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the stress induced in the wire is

Tensile stress
Bending stress
Compressive stress
Shear stress

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Machine Design
In a hydrodynamic lubricated bearing

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

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