Exam Question
Select the correct statement/statements and explain: "Wiping" of a bearing may occur due to (16)
(a) Inadequate oil supply
(b) High lub oil pressure
(c) Presence of excessive moisture in the oil.
Class 4 (4th Engineer)
MEKM
📅 Sep 2022
Reference Answer
### Introduction: Bearing Wiping
Bearing "wiping" is a specific mode of failure in soft-metal plain bearings, such as those lined with white metal (Babbitt). It is characterized by the overheating, melting, and subsequent smearing or spreading of the bearing material across the surface. This failure is a direct consequence of a breakdown in the lubrication regime, leading to direct metal-to-metal contact between the rotating journal and the stationary bearing shell.
The primary function of lubricating oil in a bearing is to create a hydrodynamic film that physically separates the moving surfaces, support the load, and carry away heat generated by fluid friction. A failure in any of these functions can lead to wiping.
### Analysis of Statements
Bearing "wiping" is a specific mode of failure in soft-metal plain bearings, such as those lined with white metal (Babbitt). It is characterized by the overheating, melting, and subsequent smearing or spreading of the bearing material across the surface. This failure is a direct consequence of a breakdown in the lubrication regime, leading to direct metal-to-metal contact between the rotating journal and the stationary bearing shell.
The primary function of lubricating oil in a bearing is to create a hydrodynamic film that physically separates the moving surfaces, support the load, and carry away heat generated by fluid friction. A failure in any of these functions can lead to wiping.
### Analysis of Statements
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