INDUSTRIAL MAINTENANCE FINAL EXAM
REVIEW 2025
the psig cut-off for low and high pressure boilers - ANSWER- 15
Number of BTUs one therm is equal to - ANSWER- 100,000
Primary air in a boiler - ANSWER- Air in the combustion process that regulates the rate
of combustion
Secondary air in a boiler - ANSWER- Air in the combustion process that controls
combustion efficiency by controlling how completely the fuel is burned
Difference between pre-fabricated and field-erected boilers - ANSWER- Field-erected
boilers are constructed on-site
Four main boiler systems - ANSWER- Feedwater, fuel, steam, draft. Page 237 of
textbook
Feedwater system - ANSWER- Supplies water to the boiler at the proper temperature
and pressure
Fuel system - ANSWER- Supplies fuel in the proper amount to the boiler
Steam system - ANSWER- Collects, controls, and distributes the steam produced in the
boiler
Draft system - ANSWER- Regulates the flow of air to and from the boiler
Sensible heat - ANSWER- Heat energy that can be measured by a change in
temperature
Latent heat - ANSWER- Heat energy that causes a change of state state and no
temperature change
Ideal boiler water pH - ANSWER- 10-11.5
Firetube boiler - ANSWER- A boiler in which the hot gases of combustion pass through
tubes surrounded by water
Watertube boiler - ANSWER- A boiler in which water passes through tubes surrounded
by the hot gases of combustion
Hydraulic power system - ANSWER- A fluid power system that transmits energy in an
enclosed space using a liquid (hydraulic oil) under pressure
REVIEW 2025
the psig cut-off for low and high pressure boilers - ANSWER- 15
Number of BTUs one therm is equal to - ANSWER- 100,000
Primary air in a boiler - ANSWER- Air in the combustion process that regulates the rate
of combustion
Secondary air in a boiler - ANSWER- Air in the combustion process that controls
combustion efficiency by controlling how completely the fuel is burned
Difference between pre-fabricated and field-erected boilers - ANSWER- Field-erected
boilers are constructed on-site
Four main boiler systems - ANSWER- Feedwater, fuel, steam, draft. Page 237 of
textbook
Feedwater system - ANSWER- Supplies water to the boiler at the proper temperature
and pressure
Fuel system - ANSWER- Supplies fuel in the proper amount to the boiler
Steam system - ANSWER- Collects, controls, and distributes the steam produced in the
boiler
Draft system - ANSWER- Regulates the flow of air to and from the boiler
Sensible heat - ANSWER- Heat energy that can be measured by a change in
temperature
Latent heat - ANSWER- Heat energy that causes a change of state state and no
temperature change
Ideal boiler water pH - ANSWER- 10-11.5
Firetube boiler - ANSWER- A boiler in which the hot gases of combustion pass through
tubes surrounded by water
Watertube boiler - ANSWER- A boiler in which water passes through tubes surrounded
by the hot gases of combustion
Hydraulic power system - ANSWER- A fluid power system that transmits energy in an
enclosed space using a liquid (hydraulic oil) under pressure
