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Process Technology Equipment, 2e (NAPTA)
Chapter 13 Furnaces
1) What type of furnace is used to heat process fluids or generate steam?
A) Box furnace
B) Vertical furnace
C) Cabin furnace
D) Cylindrical furnace
2) What type of furnace draft has no mechanical draft or fans?
A) Assisted draft
B) Induced draft
C) Natural draft
D) Balanced draft
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3) What type of furnace draft uses a fan located at the top of the furnace to draw flue gas from
the furnace body into the stack?
A) Assisted draft
B) Induced draft
C) Natural draft
D) Balanced draft
4) What component of the furnace is located at or near the radiant section?
A) Shock bank
B) Stack
C) Damper
D) Bridgewall
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5) What is the system that is used to remove combustible materials from the firebox?
A) Bridgewall
B) Purge system
C) Refractory lining
D) Shock bank tubes
6) What component of a furnace is a wall or vertical partition in the fire chamber of the furnace
that is used to deflect the heat?
A) Bridgewall
B) Purge system
C) Refractory lining
D) Shock bank tubes
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7) What is used to purge combustibles from the firebox in forced draft furnaces?
A) Fans
B) Steam
C) Water
D) Coolers
8) What may occur if a furnace does not have sufficient air?
A) Smoke production
B) High carbon monoxide (CO) emissions
C) Furnace explosions
D) All of the above
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9) What system uses sensors and logic control to shut off the supply of furnace fuel or process
feed and to shut down the furnace under certain conditions?
A) Instrument control system
B) Pressure gauge
C) Interlock control system
D) Draft control system
10) What system regulates and stabilizes the pressure in the combustion chamber?
A) Instrument control system
B) Pressure gauge
C) Interlock control system
D) Draft control system
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11) Which of the following is an example of an item that can trip an interlock and shut down a
furnace?
A) Increase of flame at the burners
B) Low temperature at the process tube exit
C) Low speed on the draft fan
D) Low firebox pressure
12) What occurs when burner flames impinge on tubes?
A) Coking
B) Fouling
C) Overheating
D) Pooling of liquids inside the firebox
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13) Which of the following problems can be caused by instrument malfunctions?
A) Improper fuel/air ratio
B) Complete trip-out of the furnace system
C) Unnecessary shut-downs
D) All of the above
14) Which of the following factors determines the length of time a tube can be in service before
it must be repaired or replaced?
A) External fouling
B) Carburization
C) Fuel type
D) Furnace design
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15) Which of the following hazards can cause flame impingement?
A) Bypassing safety interlocks
B) Poor control of excess air and poor draft control
C) Failure to follow flame safety procedure
D) Opening furnace inspection ports when the firebox pressure is greater than atmospheric
pressure
16) Which of the following hazards does NOT cause lost production due to downtime for
repairs?
A) Bypassing safety interlocks
B) Poor control of excess air and poor draft control
C) Failure to follow flame safety procedure
D) Opening furnace inspection ports when the firebox pressure is greater than atmospheric
pressure
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17) Which of the following is a personal safety precaution you should follow with regard to
furnaces?
A) Stand directly in front of the furnace when opening the inspection door.
B) Limit contact with the control room operator.
C) Always wear short sleeves.
D) Always wear a face shield when inspecting a natural draft furnace.
18) What is a byproduct of the combustion of fuel at high temperatures or with fuel containing
nitrogen (N2) compounds?
A) Smoke
B) NOx
C) CO
D) SOx
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19) Which of the following is a responsibility of a process technician?
A) Balance the fuel to the furnace with the process flow rates.
B) Adjust the air registers to match the fuel combustion.
C) Adjust the damper to achieve the proper firebox pressure.
D) All of the above
20) Which of the following should be included in a process technician's inspection of the
furnace?
A) Examine the internal metal skin for hot spots.
B) Examine the fire for uniform color and size.
C) Examine the furnace's internal components.
D) Examine the viscosity of the fuel source.
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21) What furnace procedure has the greatest risk for spills and fires?
A) Start-ups
B) Shut-downs
C) Normal operations
D) Maintenance operations
