Petroleum Refinery Engineering
During electrical desalting of crude oil, the electrical conductivity of a mixture of crude oil and water (which ranges between 3 to 8% water) __________ with increase in the amount of water.

Increases
Decreases linearly
Remains unchanged
Decreases

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Petroleum Refinery Engineering
Asphalts are

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

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