Class 4 (4th Engineer) MEKM 📅 Jan 2025

Exam Question

(a) What do you understand by Specific fuel consumption? Give some examples of SFOC for a two stroke engine and the auxiliary engines. (6)

(b) Explain the terms: (12)

(i) Flash point,

(ii) Pour point,

(iii) Calorific value,

(iv) CCAI value,

(v) Octane number and

(vi) Cetene number

Reference Answer

### Part (a): Specific Fuel Oil Consumption (SFOC)
**(i) Definition and Significance**
Specific Fuel Oil Consumption (SFOC) is a primary measure of the thermal efficiency of an internal combustion engine. It is defined as the mass of fuel consumed per unit of energy produced over a specific period. The standard unit for SFOC is grams per kilowatt-hour (g/kWh).
* **Efficiency Indicator:** A lower SFOC value indicates a higher thermal efficiency, meaning the engine converts a larger portion of the fuel's chemical energy into useful mechanical work.

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