Petroleum Refinery Engineering
Presence of predominantly large quantity of aromatics (polynuclear) is not desirable in aviation fuel, because it has

All of these
Low viscosity index
High pour point and low smoke point
High self-ingnition temperature

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Petroleum Refinery Engineering
Asphalts are

Readily oxidisable and form carbonaceous sludge
All of these
Desirable in catalytic cracking feedstock, because they produce coke
. Low molecular weight & low boiling point compounds present in petroleum

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