BLACK SEAL TEST STUDY GUIDE 230
QUESTIONS CERTIFICATION EVALUATION
2026 SOLVED QUESTIONS AND SOLUTIONS
GRADED A+
⩥ 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
QUESTIONS CERTIFICATION EVALUATION
2026 SOLVED QUESTIONS AND SOLUTIONS
GRADED A+
⩥ 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
