Petroleum Refinery Engineering
Viscosity index of a lubricating oil

None of these
Is the measure of variation of viscosity with temperature
Should be low
Is the measure of its flash point

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Petroleum Refinery Engineering
Asphalts are

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

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