BLACK SEAL LOW PRESSURE EXAM 65 QUESTIONS
& CORRECT ANSWERS LATEST 2025
If a baffle breaks, what happens? - ANSWER-Increase of furnace gases & stack
temperature
When would a high suction line be used in a fuel tank? - ANSWER-when there is
sludge or water in the tank
If not performed annually, what can cause a catastrophic event - ANSWER-Full
boiler inspection
The science of heating and cooling with water is called - ANSWER-hydronics
What is the most common cause of cast iron boiler failure? - ANSWER-Cracking
What is the most common cause of problems in a hot water system? - ANSWER-
air
A steam gauge is calibrated in - ANSWER-pounds per square inch
What code is a heating boiler built to - ANSWER-ASME Section IV
, The expansion tank is a hot water system allows for the expansion of - ANSWER-
water
As the water in a hot water system expands - ANSWER-pressure remains constant
The most common type of pressure control device used is the - ANSWER-Mercury
tube
Heavy soot on the fireside of tubes: - ANSWER-Should be removed for better heat
transfer
When connecting a Bourdon tube steam gauge to a boiler, a pigtail is used to -
ANSWER-protect bourdon tube from steam
What is the min. temp. of a hot water boiler operation to prevent condensation? -
ANSWER-170 F
The amount of draft is not affect by the height of the stack - ANSWER-False
An aquastat is sensitive to change in - ANSWER-water temperature
who can adjust a safety valve? - ANSWER-Manufacturer representative
the pressuretrol - ANSWER-Turns the burner on and off
A modulating pressuretrol controls - ANSWER-The boiler's high and low fire
& CORRECT ANSWERS LATEST 2025
If a baffle breaks, what happens? - ANSWER-Increase of furnace gases & stack
temperature
When would a high suction line be used in a fuel tank? - ANSWER-when there is
sludge or water in the tank
If not performed annually, what can cause a catastrophic event - ANSWER-Full
boiler inspection
The science of heating and cooling with water is called - ANSWER-hydronics
What is the most common cause of cast iron boiler failure? - ANSWER-Cracking
What is the most common cause of problems in a hot water system? - ANSWER-
air
A steam gauge is calibrated in - ANSWER-pounds per square inch
What code is a heating boiler built to - ANSWER-ASME Section IV
, The expansion tank is a hot water system allows for the expansion of - ANSWER-
water
As the water in a hot water system expands - ANSWER-pressure remains constant
The most common type of pressure control device used is the - ANSWER-Mercury
tube
Heavy soot on the fireside of tubes: - ANSWER-Should be removed for better heat
transfer
When connecting a Bourdon tube steam gauge to a boiler, a pigtail is used to -
ANSWER-protect bourdon tube from steam
What is the min. temp. of a hot water boiler operation to prevent condensation? -
ANSWER-170 F
The amount of draft is not affect by the height of the stack - ANSWER-False
An aquastat is sensitive to change in - ANSWER-water temperature
who can adjust a safety valve? - ANSWER-Manufacturer representative
the pressuretrol - ANSWER-Turns the burner on and off
A modulating pressuretrol controls - ANSWER-The boiler's high and low fire
