Q9. (A) Explain how wear on bearing surfaces is effected by each of the following factors:
(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. (8)
(b) Describe how each effect may be identified during inspection, Suggest corrective action at either operational or maintenance stages. (8)
Q7. Explain why a material may fracture when stressed below its yield point. Give examples of components which might fracture in this way if suitable precautions are not taken. Explain how such fractures can be avoided with reference to the materials chosen, careful design and workmanship. (16)
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