C Semester

Fuels, Match

Ερώτηση 1 (Αντιστοίχιση — 10 βαθμοί) 

Match the definitions

Στήλη Α Κάντε την αντιστοιχία Στήλη B
1. It detects all acids present; if it is elevated it may be an indicator of other harmful components.
A. Aluminium and silicon
2. Its limit has been introduced in order to restrict the content of catalytic fines, mainly Al2O3 and SiO2, in the oil. Catalytic fines give rise to abrasive wear, and their content should, therefore, be reduced as much as possible by centrifuging the fuel oil before it reaches the engine.
B. homogenizers
3. A rough indicator of ignition quality; the Calculated Carbon Aromaticity Index is used as an indication, calculated on the basis of an empirical formula that includes density and viscosity, but might sometimes not be efficient for pre- dicting the ignition quality
C. acid number
4. an index of the ignition quality of residual fuel oil. The running of all internal combustion engines is dependent on the ignition quality of the fuel. For spark-ignition engines the fuel has an octane rating.
D. Ash
5. In diesel engines, a repetitive knocking sound when delayed ignition causes sudden high pressures
E. Lube Oil Blending on Board
6. It represents the incombustible components of fuel oil.
F. Kinematic Viscosity
7. product that does not meet the Quality Specifications.
G. Off spec fuels
8. used to disperse any water and sludge remaining in the fuel after centrifuging. Placed after the centrifuge will render fresh water harmless to the engine. It also is a means to deal with incompatibility problems.
H. diesel knock
9. A new concept makes it possible to add additives to the engine system oil and then utilise it as cylinder lube oil.
I. CCAI
10. the absolute viscosity of a liquid divided by its density at the same temperature.
J. Ignition properties