Question 1

What characteristic of process feedstock determines the temperature?&#10;A) Weight&#10;B) Quality&#10;C) Effluent analysis&#10;D) All of the above

Accepted Answer

A) Incorrect. The temperature is determined by process feedstock effluent analysis.
B) Incorrect. The temperature is determined by process feedstock effluent analysis.
C) Correct. The temperature is determined by process feedstock effluent analysis.
D) Incorrect. The temperature is determined by process feedstock effluent analysis.

Question 2

What is the hottest section of the furnace?&#10;A) Damper&#10;B) Radiant tubes&#10;C) Firebox&#10;D) Refractory

Accepted Answer

A) Incorrect. The purpose of the damper is to regulate the flow of air or draft in the furnace.
B) Incorrect. Radiant tubes are tubes located in the firebox that receive heat primarily through radiant heat transfer from the burners.
C) Correct. The firebox is the combustion area. It is the hottest section of the furnace.
D) Incorrect. The refractory lining, sometimes called fire brick, is a bricklike form of insulation used inside high temperature applications.

Question 3

What improper operation can cause flashbacks?&#10;A) Failure to wear proper protective equipment&#10;B) Failure to follow flame safety procedure&#10;C) Poor control of excess air and draft control&#10;D) Opening inspection ports when the firebox has a positive pressure or pressure greater than atmospheric

Accepted Answer

A) Incorrect. Failure to follow flame safety procedure can cause flashbacks.
B) Correct. Failure to follow flame safety procedure can cause flashbacks.
C) Incorrect. Failure to follow flame safety procedure can cause flashbacks.
D) Incorrect. Failure to follow flame safety procedure can cause flashbacks.

Question 4

What type of draft system has no fans or mechanically produced draft?&#10;A) Forced draft&#10;B) Natural draft&#10;C) Balanced draft&#10;D) Induced draft

Accepted Answer

A) Incorrect. A forced draft furnace uses fans or blowers located at the base of the furnace to force air into the air registers.
B) Correct. A natural draft furnace has no fans or mechanically produced draft.
C) Incorrect. A balanced draft furnace uses two fans to facilitate airflow: one providing positive pressure to the burners (forced draft) and one pulling flow out of the firebox through the stack (induced draft).
D) Incorrect. An induced draft furnace uses fans, located at the top of the furnace, to pull air up through the furnace.

Question 5

What process is used in the operation of furnaces when the heat is transferred through the walls of the tubes to the process fluid?&#10;A) Convection&#10;B) Conduction&#10;C) Evaporation&#10;D) Radiation

Accepted Answer

A) Incorrect. Heat is transferred through the walls of the tubes to the process fluid via conduction.
B) Correct. Heat is transferred through the walls of the tubes to the process fluid via conduction.
C) Incorrect. Heat is transferred through the walls of the tubes to the process fluid via conduction.
D) Incorrect. Heat is transferred through the walls of the tubes to the process fluid via conduction.

Question 6

Which of the following improper operations will not cause a loss in production due to downtime for repairs?&#10;A) Bypassing safety interlocks&#10;B) Failure to follow flame safety procedure&#10;C) Poor control of excess air and draft control&#10;D) Opening inspection ports when the firebox has a positive pressure or pressure greater than atmospheric

Accepted Answer

A) Incorrect. Bypassing safety interlocks can cause a loss in production due to downtime for repairs.
B) Incorrect. Failure to follow flame safety procedure can cause a loss in production due to downtime for repairs.
C) Incorrect. Poor control of excess air and draft control can cause a loss in production due to downtime for repairs.
D) Correct. Opening inspection ports when the firebox has a positive pressure or pressure greater than atmospheric will not cause a loss in production due to downtime for repairs.

Question 7

What type of draft system uses fans, located at the top of the furnace, to pull air up through the furnace?&#10;A) Forced draft&#10;B) Natural draft&#10;C) Balanced draft&#10;D) Induced draft

Accepted Answer

A) Incorrect. A forced draft furnace uses fans or blowers located at the base of the furnace to force air into the air registers.
B) Incorrect. A natural draft furnace has no fans or mechanically produced draft.
C) Incorrect. A balanced draft furnace uses two fans to facilitate airflow: one providing positive pressure to the burners (forced draft) and one pulling flow out of the firebox through the stack (induced draft).
D) Correct. An induced draft furnace uses fans, located at the top of the furnace, to pull air up through the furnace.

Question 8

What is a condition in which the flames from a burner touch the tubes in the furnace?&#10;A) Hot spots&#10;B) Breech&#10;C) Flame impingement&#10;D) Furnace purge

Accepted Answer

A) Incorrect. Hot spots areas within a radiant section furnace tube, or areas within a furnace firebox, that have been overheated due to flame impingement or some other cause.
B) Incorrect. Breech is the area below the stack where flue gases are collected past the last convection tubes.
C) Correct. Flame impingement is a condition in which the flames from a burner touch the tubes in the furnace.
D) Incorrect. Furnace purge is a method of using steam or air to remove combustibles from a furnace firebox prior to lighting the burner and startup.

Question 9

What section of a furnace contains the burners?&#10;A) Radiant&#10;B) Convection&#10;C) Stack&#10;D) Cabin furnace

Accepted Answer

A) Correct. The radiant section contains the burners.
B) Incorrect. The convection section contains the shield or shock bank and the breech area.
C) Incorrect. The stack provides the outlet for discharge of flue gas from the furnace.
D) Incorrect. Cabin furnaces are called cabin because their shape resembles a cabin with a chimney.

Question 10

What provides the main source of air to the furnace?&#10;A) Damper&#10;B) Air register&#10;C) Furnace purge&#10;D) Stack

Accepted Answer

A) Incorrect. The purpose of the damper is to regulate the flow of air or draft in the furnace.
B) Correct. An air register, also called the burner damper, provides the main source of air to the furnace.
C) Incorrect. A furnace purge is the process of adding steam or air flow to the firebox in order to remove, or sweep, combustibles from the furnace prior to lighting the burner and startup.
D) Incorrect. The stack is a cylindrical outlet, located at the top of a furnace through which flue (combustion) gas is removed from the furnace.

Question 11

Which of the following is a process where a furnace is used?&#10;A) Cool water&#10;B) Superheat steam&#10;C) Remove chemicals from a raw material&#10;D) All of the above

Accepted Answer

The answer of Which of the following is a process...

Question 12

Which factor does a furnace design depend on?&#10;A) Tube arrangement&#10;B) Burner arrangement&#10;C) Whether the furnace is part of a larger process unit&#10;D) All of the above

Accepted Answer

The answer of Which factor does a furnace design depend...

Question 13

What improper operation can cause burn, injuries, or death?&#10;A) Bypassing safety interlocks&#10;B) Failure to follow flame safety procedure&#10;C) Poor control of excess air and draft control&#10;D) All of the above

Accepted Answer

The answer of What improper operation can cause burn, injuries,...

Question 14

What is the process called that separates the components of crude oil in order to break heavier hydrocarbon molecules into lighter hydrocarbon molecules?&#10;A) Fracking&#10;B) Cracking&#10;C) Process heater&#10;D) Fireboxing

Accepted Answer

The answer of What is the process called that separates...

Question 15

Which of the following should a process technician not do when monitoring and maintaining furnaces?&#10;A) Check draft balance (pressures)&#10;B) Check burner balance (fuel-to-air) ratios&#10;C) Observe flame color in firebox&#10;D) Using YouTube check for excessive vibration

Accepted Answer

The answer of Which of the following should a process...

Deck 22: Furnaces