(NEWEST 2026-2027) BLACK SEAL EXAM QUESTIONS AND
CORRECT ANSWERS
What is the acronym for PSIA? ANSWER : ambient pressure plus Psig
Carryover may result in: - ANSWER Water Hammer
The gauge glass and water column should be blown down every day.
What temperature does the water return to after leaving the boiler at 170°C?
ANSWER 150
What is the most frequent reason why cast iron boilers fail? Cracking the
ANSWER
ANSWER Air is necessary for the positioning control to operate.
Which issue with a hot water system occurs most frequently? ANSWER Air
Which fire tube has the highest efficiency? ANSWER 4 Pass
On a serpentine boiler, where are the combustion gasses located? A response
beneath the tubes
What is a check valve used for? The ANSWER is to allow flow in one
direction and prevent reverse flow.
,An automatic gas shutoff valve is known as a solenoid valve.
The ANSWER Mercury Tube is the most often used kind of pressure control
device.
The unit of measurement for a steam gauge is ANSWER Lbs/Sq. One inch
For improved heat transfer, heavy soot on the tubes' sides should be cleaned.
Which code does a heating boiler adhere to? ANSWER ASME Section IV(4)
A pigtail is used when attaching a Bourdon tube steam gauge to a boiler in order
to: ANSWER Protect the Bourdon tube from steam
The procedure of treating feed water externally might be _____. - ANSWER
Ion exchange, hot lime soda, or cold lime soda
ANSWER Solids and other contaminants may be present in natural water.
What is a hot water boiler's minimum operating temperature to avoid
condensation? ANSWER 170 F
What test is run on the boiler that has been re-tubed (repaired), and what is the
water temperature? Hydrostatic test at 70 degrees Fahrenheit
T/F: The height of the stack has no bearing on the quantity of draft. ANSWER
Untrue
, Which ASME part deals with heating boiler maintenance and operation?
Section VI (6) of the ANSWER
The following variables can affect an aquastat: ANSWER Water temperature
A hot water system's expansion tank enables the expansion of: - ANSWER
Water
A safety valve can be adjusted by whom? Manufacturer Representative's
Response
In a hot water system, when the water expands: ANSWER The pressure stays
the same
The boiler's high and low fire is controlled by a modulating pressure trol.
The boiler is turned on and off using the pressure control: ANSWER
The following factors affect a modulating pressure control: ANSWER
Pressure
The following factors can affect a vaporstat: ANSWER Gas Pressure
It is necessary to blow down the low water fuel cut-off: - ANSWER Daily
The ANSWER Fuel line solenoid valve is activated when the vaporstat begins
to function.
When there is a low water fuel cutoff, the fuel supply is turned off.
CORRECT ANSWERS
What is the acronym for PSIA? ANSWER : ambient pressure plus Psig
Carryover may result in: - ANSWER Water Hammer
The gauge glass and water column should be blown down every day.
What temperature does the water return to after leaving the boiler at 170°C?
ANSWER 150
What is the most frequent reason why cast iron boilers fail? Cracking the
ANSWER
ANSWER Air is necessary for the positioning control to operate.
Which issue with a hot water system occurs most frequently? ANSWER Air
Which fire tube has the highest efficiency? ANSWER 4 Pass
On a serpentine boiler, where are the combustion gasses located? A response
beneath the tubes
What is a check valve used for? The ANSWER is to allow flow in one
direction and prevent reverse flow.
,An automatic gas shutoff valve is known as a solenoid valve.
The ANSWER Mercury Tube is the most often used kind of pressure control
device.
The unit of measurement for a steam gauge is ANSWER Lbs/Sq. One inch
For improved heat transfer, heavy soot on the tubes' sides should be cleaned.
Which code does a heating boiler adhere to? ANSWER ASME Section IV(4)
A pigtail is used when attaching a Bourdon tube steam gauge to a boiler in order
to: ANSWER Protect the Bourdon tube from steam
The procedure of treating feed water externally might be _____. - ANSWER
Ion exchange, hot lime soda, or cold lime soda
ANSWER Solids and other contaminants may be present in natural water.
What is a hot water boiler's minimum operating temperature to avoid
condensation? ANSWER 170 F
What test is run on the boiler that has been re-tubed (repaired), and what is the
water temperature? Hydrostatic test at 70 degrees Fahrenheit
T/F: The height of the stack has no bearing on the quantity of draft. ANSWER
Untrue
, Which ASME part deals with heating boiler maintenance and operation?
Section VI (6) of the ANSWER
The following variables can affect an aquastat: ANSWER Water temperature
A hot water system's expansion tank enables the expansion of: - ANSWER
Water
A safety valve can be adjusted by whom? Manufacturer Representative's
Response
In a hot water system, when the water expands: ANSWER The pressure stays
the same
The boiler's high and low fire is controlled by a modulating pressure trol.
The boiler is turned on and off using the pressure control: ANSWER
The following factors affect a modulating pressure control: ANSWER
Pressure
The following factors can affect a vaporstat: ANSWER Gas Pressure
It is necessary to blow down the low water fuel cut-off: - ANSWER Daily
The ANSWER Fuel line solenoid valve is activated when the vaporstat begins
to function.
When there is a low water fuel cutoff, the fuel supply is turned off.
