Petroleum Refinery Engineering
Increase in the specific gravity of petroleum products indicates

Increase in thermal energy per unit weight
Decrease in paraffin content
Higher H/C ratio
Increase in aromatic content

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Petroleum Refinery Engineering
Choose the correct statement regarding thermal cracking.

At low pressure, the yield of lighter hydrocarbons are more
Greater depth of cracking gives lower octane number gasoline
Increased residence time results in the decreased severity of cracking
Moderate changes in operating temperature does not change the depth of cracking

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