Class 4 (4th Engineer) MEKM 📅 Oct 2022

Exam Question

(a) Sketch diagrammatically a device for controlling the viscosity of the fuel oil to the injectors. (8)

(b) State the value at which the viscosity should be maintained. (3)

(c) If the viscosity controller were to be inoperative what means may then be employed to operate the engine satisfactorily (5)

Reference Answer

### (a) Sketch diagrammatically a device for controlling the viscosity of the fuel oil to the injectors.
**Concept of Fuel Oil Viscosity Control:**
Maintaining the correct viscosity of heavy fuel oil (HFO) at the point of injection is paramount for efficient combustion, optimal engine performance, and component longevity. The primary method of controlling HFO viscosity is by regulating its temperature, as viscosity is inversely proportional to temperature. A typical device employs a closed-loop automatic control system.
**Construction and Operation of an Automatic Fuel Oil Viscosity Controller:**

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