Exam Question
(a) Explain the purpose and applications of using lubricating oils on board. (8)
(b) Name the types of lubricating oil used on ships and mention various properties of same and there significance. (8)
Class 4 (4th Engineer)
MEKG
📅 Sep 2023
Reference Answer
### Part (a): Purpose and Applications of Lubricating Oils on Board (8 Marks)
Lubricating oil is the lifeblood of marine machinery. Its primary purpose is to create a separating film between moving parts to minimize friction and wear. However, its functions are multifaceted and crucial for the reliability and longevity of all on-board equipment.
**1. Friction Reduction:**
* **Principle:** The primary function is to interpose a fluid film between surfaces in relative motion, replacing high-friction solid-to-solid contact with low-friction fluid shear. This significantly reduces the energy required to operate machinery.
Lubricating oil is the lifeblood of marine machinery. Its primary purpose is to create a separating film between moving parts to minimize friction and wear. However, its functions are multifaceted and crucial for the reliability and longevity of all on-board equipment.
**1. Friction Reduction:**
* **Principle:** The primary function is to interpose a fluid film between surfaces in relative motion, replacing high-friction solid-to-solid contact with low-friction fluid shear. This significantly reduces the energy required to operate machinery.
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