A. Where the surfaces of the journal and the bearing are separated by a thick film of lubricant B. Where the surfaces of the journal and the bearing are partially separated by a film of lubricant and there is partial metal-to-metal contact C. Where the surfaces of the journal and the bearing are separated by a film created by elastic deflection of parts D. Where there is no lubricant
Answer: D - Where there is no lubricant
A zero film bearing is a bearing where there is no lubricant.
Solution:
A bearing in which the working surfaces are totally isolated from one another by the lubricant is called a thick film bearing. They are also referred to as bearings with hydrodynamic lubrication.
A bearing in which the working surfaces are partially separated by a film of lubricant from one another is called a thin film bearing, and there is partial metal-to-metal contact.
A zero film bearing is a bearing where there is no lubricant.
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