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A thick lubrication is

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  1. A stable lubrication and there is no metal to metal contact
  2. A stable lubrication because there is some amount of metal to metal contact
  3. An unstable lubrication because there is some amount of metal to metal contact
  4. An unstable lubrication because there is no metal to metal contact

Answer (Detailed Solution Below)

Option 1 : A stable lubrication and there is no metal to metal contact
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Detailed Solution

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Explanation:

Thick film lubrication:

  • It is the condition of lubrication where two surfaces of the bearings are completely separated by the film of liquid, in this type of lubrication, the load is taken completely by the oil film.
  • Thick film lubrication is of two types
    1. Hydrodynamic Lubrication: In this type of lubrication the load supporting fluid film is created by the shape and relative motion of the sliding surfaces.
    2. Hydrostatic Lubrication: In this type of lubrication the load supporting fluid film is created by a external source, like a pump, supplying sufficient fluid under pressure. 
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More Thick Film Lubrication Questions

Q1.Statement (I): The journal while rotating inside a bearing automatically shifts its centre to one side and thus the journal is eccentric inside the bearing. Statement (II): The wedge shape of oil film gives rise to thin-film lubrication, which is considered as stable lubrication.
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