1 | Page
Black Seal Test Questions and Correct
Answers
What does PSIA stand for? Ans: Psig + atmospheric pressure
Carryover can lead to: Ans: Water Hammer
Water column & gauge glass should be blown down: Ans: Daily
If water leaves the boiler at 170•, what temperature does it return
at? Ans: 150•
What is the most common cause of cast iron boiler failure? Ans:
Cracking
The positioning control cannot function without: Ans: Air
What is the most common of problems in a hot water system?
Ans: Air
What fire tube is most efficient? Ans: 4 Pass
Where are the combustion gases on a serpentine boiler? Ans:
Below the tubes
What is the purpose of a check valve? Ans: To Prevent reverse
flow & Allow flow in one direction
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, 2 | Page
A solenoid valve: Ans: Is an automatic gas shutoff valve
The most common type of pressure control device used is the:
Ans: Mercury Tube
A steam gauge is calibrated in: Ans: Lbs/Sq. Inch
Heavy soot on the fireside of tubes: Ans: Should be removed for
better heat transfer
What code is a heating boiler built to: Ans: ASME Section IV(4)
When connecting a Bourdon tube steam gauge to a boiler, a pigtail
is used to: Ans: Protect Bourdon tube from steam
External feed water treatment can be a _____ process. Ans: Cold
lime soda, hot lime soda, or ion exchange
Natural water may contain: Ans: Solids and other pollutions
What is the min. temp of a hot water boiler operation to prevent
condensation? Ans: 170 F
What test is performed on re-tubed (repaired) boiler and what is
the water temp.? Ans: Hydrostatic test at 70F
T/F: The amount of draft is not affected by the height of the stack.
Ans: False
© 2025 All rights reserved
, 3 | Page
Under what ASME section is the care and operation of heating
boilers? Ans: Section VI (6)
A aquastat is sensitive to changes in: Ans: Water temperature
The expansion tank in a hot water system allows for the expansion
of: Ans: Water
Who can adjust a safety valve? Ans: Manufacturer Representative
As the water in a hot water system expands: Ans: The pressure
remains constant
A modulating pressuretrol controls: Ans: The boiler's high and
low fire
The pressuretrol: Ans: Turns the boiler on and off
A modulating pressure control is sensitive to: Ans: Pressure
A vaporstat is sensitive to: Ans: Gas Pressure
The low water fuel cut-off should be blown down: Ans: Daily
When the vaporstat starts operating, it activates the: Ans: Fuel
line solenoid valve
A low water fuel cutoff: Ans: Shuts off the fuel supply
© 2025 All rights reserved
Black Seal Test Questions and Correct
Answers
What does PSIA stand for? Ans: Psig + atmospheric pressure
Carryover can lead to: Ans: Water Hammer
Water column & gauge glass should be blown down: Ans: Daily
If water leaves the boiler at 170•, what temperature does it return
at? Ans: 150•
What is the most common cause of cast iron boiler failure? Ans:
Cracking
The positioning control cannot function without: Ans: Air
What is the most common of problems in a hot water system?
Ans: Air
What fire tube is most efficient? Ans: 4 Pass
Where are the combustion gases on a serpentine boiler? Ans:
Below the tubes
What is the purpose of a check valve? Ans: To Prevent reverse
flow & Allow flow in one direction
© 2025 All rights reserved
, 2 | Page
A solenoid valve: Ans: Is an automatic gas shutoff valve
The most common type of pressure control device used is the:
Ans: Mercury Tube
A steam gauge is calibrated in: Ans: Lbs/Sq. Inch
Heavy soot on the fireside of tubes: Ans: Should be removed for
better heat transfer
What code is a heating boiler built to: Ans: ASME Section IV(4)
When connecting a Bourdon tube steam gauge to a boiler, a pigtail
is used to: Ans: Protect Bourdon tube from steam
External feed water treatment can be a _____ process. Ans: Cold
lime soda, hot lime soda, or ion exchange
Natural water may contain: Ans: Solids and other pollutions
What is the min. temp of a hot water boiler operation to prevent
condensation? Ans: 170 F
What test is performed on re-tubed (repaired) boiler and what is
the water temp.? Ans: Hydrostatic test at 70F
T/F: The amount of draft is not affected by the height of the stack.
Ans: False
© 2025 All rights reserved
, 3 | Page
Under what ASME section is the care and operation of heating
boilers? Ans: Section VI (6)
A aquastat is sensitive to changes in: Ans: Water temperature
The expansion tank in a hot water system allows for the expansion
of: Ans: Water
Who can adjust a safety valve? Ans: Manufacturer Representative
As the water in a hot water system expands: Ans: The pressure
remains constant
A modulating pressuretrol controls: Ans: The boiler's high and
low fire
The pressuretrol: Ans: Turns the boiler on and off
A modulating pressure control is sensitive to: Ans: Pressure
A vaporstat is sensitive to: Ans: Gas Pressure
The low water fuel cut-off should be blown down: Ans: Daily
When the vaporstat starts operating, it activates the: Ans: Fuel
line solenoid valve
A low water fuel cutoff: Ans: Shuts off the fuel supply
© 2025 All rights reserved
