Machine Design
Spring index is

Its capability of storing energy
Load required to produce unit deflection
Indication of quality of spring
Ratio of coil diameter to wire diameter

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Machine Design
In a hydrodynamic lubricated bearing

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

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