Black Seal High Pressure Exam
Questions and Answers 100% Solved
What are the four main systems of a steam boiler? - ✔✔Fuel, Draft,
Feedwater, and Steam
What is the first thing an operator should do when entering a steam boiler
room? - ✔✔Check the water level of the boiler(s)
Describe the design of a firetube boiler - ✔✔Fire inside the tubes,
surrounded by water
What is the primary purpose of Low Water Fuel Cut-Off (LWCO)? -
✔✔Shut off the fuel supply to the boiler in the event of low water
How often should the low water cut-off be tested? - ✔✔Once per day by
law. Once per shift is best practice.
What is an alternative way to verify water level without using the gauge
glass? - ✔✔Using the Try Cocks
1
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
,What is sensible heat? - ✔✔A change in temperature without a change in
matter
What unit is used in our industry to measure heat? - ✔✔BTU's
Describe thermal expansion - ✔✔The tendency of matter to change in
volume in response to a change in temperature
What is the most important rule of safe boiler operation? - ✔✔Maintain
water level
What type of heat is a larger exchange of BTU's and results in a change in
matter without changing temperature? - ✔✔Latent Heat
Which temperature scale is used by the majority of the world? - ✔✔Celcius
How often, by law, must a boiler be inspected? - ✔✔Annually
A change in temperature is an example of: - ✔✔Sensible heat
How many BTU's does it take to change one pound of water into one
pound of steam? - ✔✔970.3
What type of heat is a larger exchange of BTU's? - ✔✔Latent Heat
What is the most common fuel oil used in boilers? - ✔✔#2
2
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
, What are the 4 fundamentals of combustion? - ✔✔Mixture, Atomization,
Time, Temperature
What PH level is ideal in boiler operation? - ✔✔10-11.5
Visible black smoke coming from the boiler stack would most likely be an
indication of: - ✔✔A lack of air in the combustion process
Which type of valve allows the flow of feedwater in one direction only? -
✔✔Check Valve
Which two minerals contribute to scale? - ✔✔Calcium and Magnesium
What device is used to measure draft? - ✔✔Manometer
What is the purpose of a safety valve? - ✔✔Prevent overpressure of the
boiler
What type of draft fan would be located in between the chimney and the
boiler furnace? - ✔✔Induced Draft Fan
What valve is allowed between the safety valve and the boiler? - ✔✔No
Valve Ever
How is a boiler's steam capacity measured? - ✔✔lbs/hr
3
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
Questions and Answers 100% Solved
What are the four main systems of a steam boiler? - ✔✔Fuel, Draft,
Feedwater, and Steam
What is the first thing an operator should do when entering a steam boiler
room? - ✔✔Check the water level of the boiler(s)
Describe the design of a firetube boiler - ✔✔Fire inside the tubes,
surrounded by water
What is the primary purpose of Low Water Fuel Cut-Off (LWCO)? -
✔✔Shut off the fuel supply to the boiler in the event of low water
How often should the low water cut-off be tested? - ✔✔Once per day by
law. Once per shift is best practice.
What is an alternative way to verify water level without using the gauge
glass? - ✔✔Using the Try Cocks
1
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
,What is sensible heat? - ✔✔A change in temperature without a change in
matter
What unit is used in our industry to measure heat? - ✔✔BTU's
Describe thermal expansion - ✔✔The tendency of matter to change in
volume in response to a change in temperature
What is the most important rule of safe boiler operation? - ✔✔Maintain
water level
What type of heat is a larger exchange of BTU's and results in a change in
matter without changing temperature? - ✔✔Latent Heat
Which temperature scale is used by the majority of the world? - ✔✔Celcius
How often, by law, must a boiler be inspected? - ✔✔Annually
A change in temperature is an example of: - ✔✔Sensible heat
How many BTU's does it take to change one pound of water into one
pound of steam? - ✔✔970.3
What type of heat is a larger exchange of BTU's? - ✔✔Latent Heat
What is the most common fuel oil used in boilers? - ✔✔#2
2
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
, What are the 4 fundamentals of combustion? - ✔✔Mixture, Atomization,
Time, Temperature
What PH level is ideal in boiler operation? - ✔✔10-11.5
Visible black smoke coming from the boiler stack would most likely be an
indication of: - ✔✔A lack of air in the combustion process
Which type of valve allows the flow of feedwater in one direction only? -
✔✔Check Valve
Which two minerals contribute to scale? - ✔✔Calcium and Magnesium
What device is used to measure draft? - ✔✔Manometer
What is the purpose of a safety valve? - ✔✔Prevent overpressure of the
boiler
What type of draft fan would be located in between the chimney and the
boiler furnace? - ✔✔Induced Draft Fan
What valve is allowed between the safety valve and the boiler? - ✔✔No
Valve Ever
How is a boiler's steam capacity measured? - ✔✔lbs/hr
3
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
