Class 4 (4th Engineer) MEKM 📅 Nov 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. (4)

(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)
**Definition:**
Specific Fuel Oil Consumption (SFOC) is a key performance indicator that measures the efficiency of a prime mover, such as an internal combustion engine. It is defined as the mass of fuel consumed per unit of energy produced over a specific period. It effectively represents how efficiently an engine converts the chemical energy in fuel into useful mechanical work.
**Formula and Units:**

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