Question 1

What is the main reason for using stripping steam in the atmospheric column

Accepted Answer

Reduce hydrocarbon partial pressure

Question 2

High flash zone temperature may result in -------

Accepted Answer

Furnace tube coking

Question 3

Which condition most likely causes flooding in a distillation column?

Accepted Answer

Excessive vapor traffic

Question 4

What is the primary function of the flash zone in CDU?

Accepted Answer

Initial vapor-liquid separation

Question 5

Over flash in CDU is mainly used to----------

Accepted Answer

Wash heavy components downward

Question 6

Excess over flash may cause -----------

Accepted Answer

Increased furnace duty

Question 7

Which parameter is most affected by tray fouling -------------

Accepted Answer

Column pressure drop

Question 8

The primary cause of furnace tube coking is-----------

Accepted Answer

High skin temperature and long residence time

Question 9

Vacuum distillation is operated under vacuum mainly to ------------

Accepted Answer

Prevent thermal cracking

Question 10

Which factor most strongly affects crude vaporization in the furnace ------------

Accepted Answer

Coil outlet temperature

Question 11

Weeping occurs when ----------------------

Accepted Answer

Vapor flow cannot support liquid on trays

Question 12

Entrainment in a column means ---------------

Accepted Answer

Liquid carried upward with vapor

Question 13

High entrainment usually results in ------------

Accepted Answer

Product contamination

Question 14

Foaming inside the column can lead to -----------

Accepted Answer

Flooding and unstable operation

Question 15

High column bottom temperature may increase---------

Accepted Answer

Thermal cracking risk

Question 16

The main purpose of pump-around circuits is -----

Accepted Answer

Recover heat and control temperature profile

Question 17

Increasing reflux ratio generally ---------

Accepted Answer

Improves separation

Question 18

Excessive reflux may cause ---------------

Accepted Answer

Higher condenser and reboiler duty

Question 19

What is the purpose of wash oil in the top section ---------------------------

Accepted Answer

Reduce entrainment of heavy hydrocarbons

Question 20

Corrosion in the overhead system is mainly due to -----------------------

Accepted Answer

HCl and H₂S formation

Question 21

Heavy crude oils generally require ----------------

Accepted Answer

Higher furnace duty

Question 22

Low API gravity crude usually contains ------------

Accepted Answer

More residue and asphaltic material

Question 23

Desalter efficiency directly affects --------------

Accepted Answer

Overhead corrosion and fouling

Question 24

Which unit normally processes atmospheric residue ---------------------

Accepted Answer

Vacuum Distillation Unit

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