Class 2 (2nd Engineer) MEKG 📅 Jan 2023

Exam Question

With respect to properties of fuel oil, explain the significance of the following terms

(a) Calculated Carbon Aromaticity Index (CCAI).

(b) Open flash point and Closed flash point.

(d) Octane Number.

Reference Answer

### (a) Calculated Carbon Aromaticity Index (CCAI)
**1. Concept:**
CCAI is an empirically derived index number, calculated from the density and viscosity of a residual fuel oil. It is used to predict the ignition quality of the fuel. A higher CCAI value generally indicates a higher concentration of aromatic hydrocarbons, which are slower to burn and have poorer ignition characteristics.
**2. Significance & Engine Implications:**

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