Exam Question

### (a) The Necessity for Correct Fuel Oil Viscosity (8 Marks)
Correct fuel oil viscosity at the point of injection is paramount for ensuring efficient combustion, maximizing engine performance, and minimizing wear and tear on engine components. The primary purpose of controlling viscosity is to achieve optimal atomisation of the fuel as it is injected into the combustion chamber.
**Atomisation:**
This is the process of breaking the liquid fuel into a fine spray of microscopic droplets. Effective atomisation increases the surface-area-to-volume ratio of the fuel, allowing it to rapidly vaporize and mix with the hot, compressed air in the cylinder, leading to complete and efficient combustion.