Industrial Maintenance Final Exam Review 2026 – Mechanical Systems, Troubleshooting, and
Safety Study Guide
the pig cut-off for low and high pressure boilers - correct answer ✔✔ 15
Number of BTUs one thermal is equal to - correct answer ✔✔ 100,000
Primary air in a boiler - correct answer ✔✔ Air in the combustion process that regulates the rate
of combustion
Secondary air in a boiler - correct 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 - correct answer ✔✔ Field-erected
boilers are constructed on-site
Four main boiler systems - correct answer ✔✔ Feedwater, fuel, steam, draft. Page 237 of
textbook
Feedwater system - correct answer ✔✔ Supplies water to the boiler at the proper temperature
and pressure
Fuel system - correct answer ✔✔ Supplies fuel in the proper amount to the boiler
Steam system - correct answer ✔✔ Collects, controls, and distributes the steam produced in the
boiler
Draft system - correct answer ✔✔ Regulates the flow of air to and from the boiler
, Sensible heat - correct answer ✔✔ Heat energy that can be measured by a change in
temperature
Latent heat - correct answer ✔✔ Heat energy that causes a change of state state and no
temperature change
Ideal boiler water pH - correct answer ✔✔ 10-11.5
Firetube boiler - correct answer ✔✔ A boiler in which the hot gases of combustion pass through
tubes surrounded by water
Watertube boiler - correct answer ✔✔ A boiler in which water passes through tubes
surrounded by the hot gases of combustion
Hydraulic power system - correct answer ✔✔ A fluid power system that transmits energy in an
enclosed space using a liquid (hydraulic oil) under pressure
Pneumatic power system - correct answer ✔✔ A fluid power system that transmits energy using
a gas (typically compressed air)
Rigid coupling - correct answer ✔✔ A device that joins two shafts that are precisely aligned
within a common frame
Flexible coupling - correct answer ✔✔ A coupling designed to join two shafts that have a small
amount of misalignment
displacement in a hydraulic system - correct answer ✔✔ the volume of hydraulic oil moved
during each revolution, stroke, or cycle of a pump
Safety Study Guide
the pig cut-off for low and high pressure boilers - correct answer ✔✔ 15
Number of BTUs one thermal is equal to - correct answer ✔✔ 100,000
Primary air in a boiler - correct answer ✔✔ Air in the combustion process that regulates the rate
of combustion
Secondary air in a boiler - correct 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 - correct answer ✔✔ Field-erected
boilers are constructed on-site
Four main boiler systems - correct answer ✔✔ Feedwater, fuel, steam, draft. Page 237 of
textbook
Feedwater system - correct answer ✔✔ Supplies water to the boiler at the proper temperature
and pressure
Fuel system - correct answer ✔✔ Supplies fuel in the proper amount to the boiler
Steam system - correct answer ✔✔ Collects, controls, and distributes the steam produced in the
boiler
Draft system - correct answer ✔✔ Regulates the flow of air to and from the boiler
, Sensible heat - correct answer ✔✔ Heat energy that can be measured by a change in
temperature
Latent heat - correct answer ✔✔ Heat energy that causes a change of state state and no
temperature change
Ideal boiler water pH - correct answer ✔✔ 10-11.5
Firetube boiler - correct answer ✔✔ A boiler in which the hot gases of combustion pass through
tubes surrounded by water
Watertube boiler - correct answer ✔✔ A boiler in which water passes through tubes
surrounded by the hot gases of combustion
Hydraulic power system - correct answer ✔✔ A fluid power system that transmits energy in an
enclosed space using a liquid (hydraulic oil) under pressure
Pneumatic power system - correct answer ✔✔ A fluid power system that transmits energy using
a gas (typically compressed air)
Rigid coupling - correct answer ✔✔ A device that joins two shafts that are precisely aligned
within a common frame
Flexible coupling - correct answer ✔✔ A coupling designed to join two shafts that have a small
amount of misalignment
displacement in a hydraulic system - correct answer ✔✔ the volume of hydraulic oil moved
during each revolution, stroke, or cycle of a pump
