Class 4 (4th Engineer) MEKG 📅 Jul 2025

Exam Question

The by-products of oxidation, as a result of water contamination of hydraulic oil, are generally (16)

(a) removed by cellulose type filters

(b) gums, varnishes, and acids

(d) harmless and have no effect on system components

Briefly justify your answer.

Reference Answer

The correct option is **(b) gums, varnishes, and acids**.
### Justification for Correct Answer
**1. Chemical Process of Oxidation:**
Water contamination in hydraulic oil acts as a powerful catalyst, significantly accelerating the oil's oxidation process, especially under the high temperatures and pressures found in hydraulic systems. The process involves the reaction of hydrocarbon molecules in the base oil with oxygen.

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