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Class 2 (2nd Engineer) MEKM 📅 Jan 2025

Exam Question

(a) Define the following conditions relating to lubricating oil (6)

(i) Oxidation

(ii) Emulsification

(iii) Acidity

(b) Explain how each of the conditions in (a) is controlled by maintenance (5)

(c) Suggest possible consequences if the conditions in (a) change and no corrective action is taken. (5)

Reference Answer

Ans
‎(i) Oxidation:
‎Oxidation refers to the chemical reaction between lubricating oil and oxygen, often accelerated by high temperatures and the presence of catalytic metals such as iron or copper, resulting in the formation of harmful compounds like organic acids, sludge, varnish, and the increase in viscosity of the oil.
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