Petroleum Refinery Engineering
Research octane number refers to the

Unleaded motor fuels
Low octane number motor fuels
High octane number aviation fuels
High octane number motor fuels

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Petroleum Refinery Engineering
Crude oil is subjected to vacuum distillation in the last stage, because

Lighter/low boiling products are prone to thermal decomposition
High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may decompose
None of these
High purity products can be obtained thereby

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