ExxonMobil Test ExxonMobil Operations Knowledge

Question 1

What is the primary purpose of the atmospheric distillation unit (ADU) in an oil refinery?

Accepted Answer

To separate crude oil into fractions based on boiling point

Answer

The ADU uses heat and distillation to separate crude oil into fractions (naphtha, kerosene, diesel, residue) based on their boiling points.

Question 2

In refinery operations, what is 'cracking'?

Accepted Answer

Breaking large hydrocarbon molecules into smaller, more valuable ones

Answer

Cracking breaks down large, heavy hydrocarbon molecules into smaller, lighter molecules like gasoline and jet fuel.

Question 3

What does API gravity measure in the petroleum industry?

Accepted Answer

The density of petroleum relative to water

Answer

API gravity is a measure of crude oil density relative to water; lighter (higher API) crudes are generally more valuable.

Question 4

In an ExxonMobil refinery, what is the function of a hydrotreater?

Accepted Answer

To remove sulfur, nitrogen, and other impurities using hydrogen

Answer

Hydrotreaters use hydrogen under pressure and catalysts to remove sulfur, nitrogen, and metals from petroleum fractions.

Question 5

What is the main role of a catalytic reformer in a petroleum refinery?

Accepted Answer

To increase the octane rating of naphtha for gasoline blending

Answer

Catalytic reformers rearrange the molecular structure of naphtha to produce high-octane reformate for gasoline blending.

ExxonMobil Test Practice Test