BLACK SEAL EXAM TEST 2025 QUESTIONS
AND CORRECT ANSWERS
What would cause the pilot gas limit on a rotary cup oil burner to
come into operation? - ✔✔✔ Correct Answer > A lack of pilot
gas pressure
When connecting a Bourdon tube steam gauge to a boiler, a pigtail is
used to: - ✔✔✔ Correct Answer > Protect Bourdon tube from
steam
A draft fan located between the boiler and chimney is what type of
draft? - ✔✔✔ Correct Answer > Induced
What is the maximum horsepower a NJ low pressure licenced operator
can operate up to? - ✔✔✔ Correct Answer > No limit
Boiler water having high alkalinity will develop: - ✔✔✔ Correct
Answer
> Caustic embrittlement
The most accurate means of deciding the frequency of blowdown of a
boiler is determined by a ______. - ✔✔✔ Correct Answer >
Boiler water analysis
, External feed water treatment can be a _____ process. - ✔✔✔
Correct Answer > Cold lime soda, hot lime soda, or ion exchange
Natural water may contain: - ✔✔✔ Correct Answer > Solids and
other pollutions
What type of boiler is an HRT (Horizontal return tube) boiler? -
✔✔✔ Correct Answer > Fire tube
Which describes the combustion chamber of a serpentine tube heating
boiler? - ✔✔✔ Correct Answer > Located below the tubes
In hot water boilers, variations in the volume of water is taken care of
by the: - ✔✔✔ Correct Answer > Expansion tank
The two scales on the boiler pressure control: - ✔✔✔ Correct Answer
> set the operating steam pressure range
What does PSIA stand for? - ✔✔✔ Correct Answer > Psig +
atmospheric pressure
Carryover can lead to: - ✔✔✔ Correct Answer > Water Hammer
Water column & gauge glass should be blown down: - ✔✔✔ Correct
Answer > Daily
, If water leaves the boiler at 170•, what temperature does it return at? -
✔✔✔ Correct Answer > 150•
What is the most common cause of cast iron boiler failure? - ✔✔✔
Correct Answer > Cracking
The positioning control cannot function without: - ✔✔✔ Correct
Answer > Air
What is the most common of problems in a hot water system? -
✔✔✔ Correct Answer > Air
What fire tube is most efficient? - ✔✔✔ Correct Answer > 4 Pass
Where are the combustion gases on a serpentine boiler? - ✔✔✔
Correct Answer > Below the tubes
What is the purpose of a check valve? - ✔✔✔ Correct Answer >
To Prevent reverse flow & Allow flow in one direction
A solenoid valve: - ✔✔✔ Correct Answer > Is an automatic gas
shutoff valve
The most common type of pressure control device used is the: -
✔✔✔ Correct Answer > Mercury Tube
AND CORRECT ANSWERS
What would cause the pilot gas limit on a rotary cup oil burner to
come into operation? - ✔✔✔ Correct Answer > A lack of pilot
gas pressure
When connecting a Bourdon tube steam gauge to a boiler, a pigtail is
used to: - ✔✔✔ Correct Answer > Protect Bourdon tube from
steam
A draft fan located between the boiler and chimney is what type of
draft? - ✔✔✔ Correct Answer > Induced
What is the maximum horsepower a NJ low pressure licenced operator
can operate up to? - ✔✔✔ Correct Answer > No limit
Boiler water having high alkalinity will develop: - ✔✔✔ Correct
Answer
> Caustic embrittlement
The most accurate means of deciding the frequency of blowdown of a
boiler is determined by a ______. - ✔✔✔ Correct Answer >
Boiler water analysis
, External feed water treatment can be a _____ process. - ✔✔✔
Correct Answer > Cold lime soda, hot lime soda, or ion exchange
Natural water may contain: - ✔✔✔ Correct Answer > Solids and
other pollutions
What type of boiler is an HRT (Horizontal return tube) boiler? -
✔✔✔ Correct Answer > Fire tube
Which describes the combustion chamber of a serpentine tube heating
boiler? - ✔✔✔ Correct Answer > Located below the tubes
In hot water boilers, variations in the volume of water is taken care of
by the: - ✔✔✔ Correct Answer > Expansion tank
The two scales on the boiler pressure control: - ✔✔✔ Correct Answer
> set the operating steam pressure range
What does PSIA stand for? - ✔✔✔ Correct Answer > Psig +
atmospheric pressure
Carryover can lead to: - ✔✔✔ Correct Answer > Water Hammer
Water column & gauge glass should be blown down: - ✔✔✔ Correct
Answer > Daily
, If water leaves the boiler at 170•, what temperature does it return at? -
✔✔✔ Correct Answer > 150•
What is the most common cause of cast iron boiler failure? - ✔✔✔
Correct Answer > Cracking
The positioning control cannot function without: - ✔✔✔ Correct
Answer > Air
What is the most common of problems in a hot water system? -
✔✔✔ Correct Answer > Air
What fire tube is most efficient? - ✔✔✔ Correct Answer > 4 Pass
Where are the combustion gases on a serpentine boiler? - ✔✔✔
Correct Answer > Below the tubes
What is the purpose of a check valve? - ✔✔✔ Correct Answer >
To Prevent reverse flow & Allow flow in one direction
A solenoid valve: - ✔✔✔ Correct Answer > Is an automatic gas
shutoff valve
The most common type of pressure control device used is the: -
✔✔✔ Correct Answer > Mercury Tube
