Petroleum Refinery Engineering
The main use of heavy gas oil produced by the vacuum distillation unit is as a

Blending component for petrol
Blending component for kerosene
Feedstock for fluid catalytic cracking unit
None of these

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Petroleum Refinery Engineering
Alkylation

Causes olefins to combine with each other
Converts olefin into paraffin
Causes olefins to combine with iso-paraffins
Converts iso-paraffin into olefin

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