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Class 2 (2nd Engineer) MEKG 📅 Jul 2025

Exam Question

(a) Explain how wear on bearing surfaces is affected by each of the following factors: (8) 

(i) Dissimilarity of materials in the contact surfaces 

(ii) Relative speed of sliding between the surfaces 

(iii) Roughness of the surfaces 

(iv) incompatibility of lubricant and bearing material. 

(b) Describe how each effect may be identified during inspection, Suggest corrective action at either operational or maintenance stages. (8) 

Reference Answer

### Part (a): Factors Affecting Wear on Bearing Surfaces
#### (i) Dissimilarity of Materials in the Contact Surfaces
* **Concept:** The selection of bearing materials is a fundamental principle of tribology to prevent severe adhesive wear (galling) and to manage abrasive particles. A hard journal (e.g., forged steel, case-hardened) is paired with a softer bearing material (e.g., white metal/Babbitt, tin-aluminium, lead-bronze).
* **Mechanism of Wear Prevention:**

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