Ερώτηση 1 / 1 (Αντιστοίχιση — 10 βαθμοί) 

Match the definitions

Στήλη Α	Κάντε την αντιστοιχία	Στήλη B
1. Aluminium and silicon	--ABCDEFGHIJ	A. All fuels have a naturally occurring acid number, however fuels with high acid numbers arising from acidic compounds can cause accelerated damage to large diesel engines, especially the fuel injection equipment.
2. Vanadium	--ABCDEFGHIJ	B. The official unit is kg/m³ at 15°C, while kg/l at 15°C is the most commonly used unit. Density is used to calculate the quantity of fuel delivered. The density gives an indication of the ignition quality of the fuel within a certain product class
3. Cloud point	--ABCDEFGHIJ	C. - Is a result of catalysts used in catalytic cracking of crude oil which leave cat fines.
4. Density	--ABCDEFGHIJ	D. Heavy cycle oil is used worldwide in complex refining as a blending component for heavy fuel. Mechanically damaged catalyst particles (aluminum silicate) cannot be removed completely in a cost-effective way, and are found in blended heavy fuel. F
5. CCAI	--ABCDEFGHIJ	E. Vanadium and nickel are elements found in certain heavy fuel oil molecules (asphaltenes). Upon combustion, vanadium oxides are formed, and some have critical melting temperatures. The most critical are the double oxides/sulphates with sodium
6. Elements	--ABCDEFGHIJ	F. The ash content is a measure of the inorganic incombustible components present in the fuel, either as inherent to the fuel or as contamination.
7. Cetane index	--ABCDEFGHIJ	G. It is defined as the temperature at which wax crystals start to visibly form in the fuel and a transparent fuel becomes cloudy. The cold filter plugging point is the lowest temperature where the fuel of a set volume drawn, by vacuum, through a standardised filter within a specified time still continues to flow
8. Catalyst fines	--ABCDEFGHIJ	H. The Calculated Carbon Aromaticity Index (CCAI) is only applicable to residual fuel oils and provides an indication of the ignition delay of a fuel oil. The CCAI is calculated from the density and viscosity of a residual fuel oil.
9. Acid Number	--ABCDEFGHIJ	I. A metallic element that chemically combines with sodium to produce very aggressive low melting point compounds responsible for accelerated deposit formation and high temperature corrosion of engine components.
10. Ash	--ABCDEFGHIJ	J. It is only applicable for gasoil and distillate fuels. It is a measure for the ignition quality of the fuel Everything You Need to Know About Marine Fuels | 11 in a diesel engine. The higher the rpm of the engine, the higher the required cetane index. The cetane index is an approximate calculated value of the cetane number, based on the density and the distillation of the fuel. The cetane index is not applicable when cetane-improving additives have been used.