BLACK SEAL TEST 230 QUESTIONS & CORRECT
ANSWERS LATEST 2025
What does PSIA stand for? - ANSWER-Psig + atmospheric pressure
Carryover can lead to: - ANSWER-Water Hammer
Water column & gauge glass should be blown down: - ANSWER-Daily
If water leaves the boiler at 170•, what temperature does it return at? - ANSWER-
150•
What is the most common cause of cast iron boiler failure? - ANSWER-Cracking
The positioning control cannot function without: - ANSWER-Air
What is the most common of problems in a hot water system? - ANSWER-Air
What fire tube is most efficient? - ANSWER-4 Pass
Where are the combustion gases on a serpentine boiler? - ANSWER-Below the
tubes
,What is the purpose of a check valve? - ANSWER-To Prevent reverse flow & Allow
flow in one direction
A solenoid valve: - ANSWER-Is an automatic gas shutoff valve
The most common type of pressure control device used is the: - ANSWER-
Mercury Tube
A steam gauge is calibrated in: - ANSWER-Lbs/Sq. Inch
Heavy soot on the fireside of tubes: - ANSWER-Should be removed for better heat
transfer
What code is a heating boiler built to: - ANSWER-ASME Section IV(4)
When connecting a Bourdon tube steam gauge to a boiler, a pigtail is used to: -
ANSWER-Protect Bourdon tube from steam
External feed water treatment can be a _____ process. - ANSWER-Cold lime soda,
hot lime soda, or ion exchange
Natural water may contain: - ANSWER-Solids and other pollutions
What is the min. temp of a hot water boiler operation to prevent condensation? -
ANSWER-170 F
, What test is performed on re-tubed (repaired) boiler and what is the water
temp.? - ANSWER-Hydrostatic test at 70F
T/F: The amount of draft is not affected by the height of the stack. - ANSWER-
False
Under what ASME section is the care and operation of heating boilers? - ANSWER-
Section VI (6)
A aquastat is sensitive to changes in: - ANSWER-Water temperature
The expansion tank in a hot water system allows for the expansion of: - ANSWER-
Water
Who can adjust a safety valve? - ANSWER-Manufacturer Representative
As the water in a hot water system expands: - ANSWER-The pressure remains
constant
A modulating pressuretrol controls: - ANSWER-The boiler's high and low fire
The pressuretrol: - ANSWER-Turns the boiler on and off
A modulating pressure control is sensitive to: - ANSWER-Pressure
A vaporstat is sensitive to: - ANSWER-Gas Pressure
ANSWERS LATEST 2025
What does PSIA stand for? - ANSWER-Psig + atmospheric pressure
Carryover can lead to: - ANSWER-Water Hammer
Water column & gauge glass should be blown down: - ANSWER-Daily
If water leaves the boiler at 170•, what temperature does it return at? - ANSWER-
150•
What is the most common cause of cast iron boiler failure? - ANSWER-Cracking
The positioning control cannot function without: - ANSWER-Air
What is the most common of problems in a hot water system? - ANSWER-Air
What fire tube is most efficient? - ANSWER-4 Pass
Where are the combustion gases on a serpentine boiler? - ANSWER-Below the
tubes
,What is the purpose of a check valve? - ANSWER-To Prevent reverse flow & Allow
flow in one direction
A solenoid valve: - ANSWER-Is an automatic gas shutoff valve
The most common type of pressure control device used is the: - ANSWER-
Mercury Tube
A steam gauge is calibrated in: - ANSWER-Lbs/Sq. Inch
Heavy soot on the fireside of tubes: - ANSWER-Should be removed for better heat
transfer
What code is a heating boiler built to: - ANSWER-ASME Section IV(4)
When connecting a Bourdon tube steam gauge to a boiler, a pigtail is used to: -
ANSWER-Protect Bourdon tube from steam
External feed water treatment can be a _____ process. - ANSWER-Cold lime soda,
hot lime soda, or ion exchange
Natural water may contain: - ANSWER-Solids and other pollutions
What is the min. temp of a hot water boiler operation to prevent condensation? -
ANSWER-170 F
, What test is performed on re-tubed (repaired) boiler and what is the water
temp.? - ANSWER-Hydrostatic test at 70F
T/F: The amount of draft is not affected by the height of the stack. - ANSWER-
False
Under what ASME section is the care and operation of heating boilers? - ANSWER-
Section VI (6)
A aquastat is sensitive to changes in: - ANSWER-Water temperature
The expansion tank in a hot water system allows for the expansion of: - ANSWER-
Water
Who can adjust a safety valve? - ANSWER-Manufacturer Representative
As the water in a hot water system expands: - ANSWER-The pressure remains
constant
A modulating pressuretrol controls: - ANSWER-The boiler's high and low fire
The pressuretrol: - ANSWER-Turns the boiler on and off
A modulating pressure control is sensitive to: - ANSWER-Pressure
A vaporstat is sensitive to: - ANSWER-Gas Pressure
