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Ohio stationary steam engineer Actual Exam
Newest Complete 100 Questions And Correct
Detailed Answers| Already Graded A+
Updated for 2026 | Graded A+ | Based on Official Ohio Boiler Division Body of Knowledge
This comprehensive exam guide is based on the official State of Ohio Department of Commerce,
Division of Industrial Compliance requirements and the recommended textbook Steam Plant Operation
(8th Edition) by Woodruff and Lammers. All questions are aligned with the Body of Knowledge for the
Ohio Stationary Steam Engineers License Examination.
SECTION 1: BASIC BOILER PRINCIPLES
Question 1
What is the primary function of a steam boiler?
A) To condense steam
B) To store feedwater
C) To convert water into steam
D) To superheat condensate
✔✔ Correct Answer✔✔ C
Rationale: Boilers are designed to generate steam by applying heat energy to water. The fundamental
purpose is to convert water to steam for power generation, heating, or process work.
Question 2
The term "latent heat of vaporization" refers to:
A) Heat required to raise temperature of water 1°F
B) Sensible heat of water
C) Heat required to change water to steam without temperature rise
D) Heat loss due to radiation
,2
✔✔ Correct Answer✔✔ C
Rationale: Latent heat changes the phase of water to steam with no temperature change. This is the
hidden heat that breaks molecular bonds during phase transition.
Question 3
A high-pressure boiler in Ohio is defined as one operating above:
A) 10 psig
B) 50 psig
C) 15 psig
D) 100 psig
✔✔ Correct Answer✔✔ C
Rationale: Per ASME Code and Ohio regulations, any steam boiler operating above 15 psig is classified as
a high-pressure boiler. Low-pressure boilers operate at 15 psig or less.
Question 4
The water level in a boiler gauge glass should be checked:
A) Weekly
B) Monthly
C) Daily
D) Annually
✔✔ Correct Answer✔✔ C
Rationale: Daily checks ensure safe water levels and prevent low-water hazards. The gauge glass is the
operator's primary visual indicator of boiler water level.
Question 5
The device that automatically maintains boiler water level is the:
A) Feedwater pump
B) Feedwater regulator
C) Steam trap
D) Condensate receiver
✔✔ Correct Answer✔✔ B
Rationale: The feedwater regulator senses water level and controls feed flow automatically, maintaining
consistent water level despite load changes.
,3
Question 6
What is the purpose of the safety valve on a boiler?
A) To release condensate
B) To control water level
C) To prevent pressure from exceeding safe limits
D) To regulate draft
✔✔ Correct Answer✔✔ C
Rationale: Safety valves automatically open to relieve excessive steam pressure. They are the most
critical safety device on a boiler, preventing catastrophic overpressure explosions.
Question 7
Which type of draft is produced by a fan located at the base of the boiler?
A) Natural draft
B) Balanced draft
C) Induced draft
D) Forced draft
✔✔ Correct Answer✔✔ D
Rationale: Forced draft fans push air into the furnace for combustion. They are located before the
furnace and create positive pressure in the combustion chamber.
Question 8
What does a steam trap remove from steam lines?
A) Steam
B) Condensate and air
C) Scale
D) Carbon dioxide
✔✔ Correct Answer✔✔ B
Rationale: Steam traps automatically discharge condensate while retaining steam. They also vent non-
condensable gases like air to maintain system efficiency.
Question 9
The purpose of a superheater is to:
A) Cool steam
B) Increase the temperature of steam above saturation
, 4
C) Reheat feedwater
D) Condense steam
✔✔ Correct Answer✔✔ B
Rationale: Superheaters raise steam temperature above saturation without increasing pressure.
Superheated steam is drier and has higher energy content for turbine efficiency.
Question 10
A "blowdown" is performed to:
A) Measure water temperature
B) Remove impurities and sludge from the boiler
C) Add feedwater automatically
D) Seal leaks
✔✔ Correct Answer✔✔ B
Rationale: Blowdown removes impurities and sediment that settle in the boiler, preventing scale
buildup and maintaining water quality.
Question 11
The maximum allowable working pressure (MAWP) is found on the:
A) Feedwater tank
B) Boiler nameplate
C) Pressure gauge
D) Water column
✔✔ Correct Answer✔✔ B
Rationale: The MAWP is stamped on the boiler nameplate as required by ASME Code. This is the
maximum pressure the boiler is designed to safely operate.
Question 12
When testing a safety valve, the pressure should:
A) Exceed the MAWP by 20%
B) Be reduced to zero
C) Be raised until the valve pops at its set pressure
D) Be manually released
✔✔ Correct Answer✔✔ C
Rationale: Proper testing requires raising pressure until the safety valve "pops" open at its designated
set pressure to ensure reliable operation.
Ohio stationary steam engineer Actual Exam
Newest Complete 100 Questions And Correct
Detailed Answers| Already Graded A+
Updated for 2026 | Graded A+ | Based on Official Ohio Boiler Division Body of Knowledge
This comprehensive exam guide is based on the official State of Ohio Department of Commerce,
Division of Industrial Compliance requirements and the recommended textbook Steam Plant Operation
(8th Edition) by Woodruff and Lammers. All questions are aligned with the Body of Knowledge for the
Ohio Stationary Steam Engineers License Examination.
SECTION 1: BASIC BOILER PRINCIPLES
Question 1
What is the primary function of a steam boiler?
A) To condense steam
B) To store feedwater
C) To convert water into steam
D) To superheat condensate
✔✔ Correct Answer✔✔ C
Rationale: Boilers are designed to generate steam by applying heat energy to water. The fundamental
purpose is to convert water to steam for power generation, heating, or process work.
Question 2
The term "latent heat of vaporization" refers to:
A) Heat required to raise temperature of water 1°F
B) Sensible heat of water
C) Heat required to change water to steam without temperature rise
D) Heat loss due to radiation
,2
✔✔ Correct Answer✔✔ C
Rationale: Latent heat changes the phase of water to steam with no temperature change. This is the
hidden heat that breaks molecular bonds during phase transition.
Question 3
A high-pressure boiler in Ohio is defined as one operating above:
A) 10 psig
B) 50 psig
C) 15 psig
D) 100 psig
✔✔ Correct Answer✔✔ C
Rationale: Per ASME Code and Ohio regulations, any steam boiler operating above 15 psig is classified as
a high-pressure boiler. Low-pressure boilers operate at 15 psig or less.
Question 4
The water level in a boiler gauge glass should be checked:
A) Weekly
B) Monthly
C) Daily
D) Annually
✔✔ Correct Answer✔✔ C
Rationale: Daily checks ensure safe water levels and prevent low-water hazards. The gauge glass is the
operator's primary visual indicator of boiler water level.
Question 5
The device that automatically maintains boiler water level is the:
A) Feedwater pump
B) Feedwater regulator
C) Steam trap
D) Condensate receiver
✔✔ Correct Answer✔✔ B
Rationale: The feedwater regulator senses water level and controls feed flow automatically, maintaining
consistent water level despite load changes.
,3
Question 6
What is the purpose of the safety valve on a boiler?
A) To release condensate
B) To control water level
C) To prevent pressure from exceeding safe limits
D) To regulate draft
✔✔ Correct Answer✔✔ C
Rationale: Safety valves automatically open to relieve excessive steam pressure. They are the most
critical safety device on a boiler, preventing catastrophic overpressure explosions.
Question 7
Which type of draft is produced by a fan located at the base of the boiler?
A) Natural draft
B) Balanced draft
C) Induced draft
D) Forced draft
✔✔ Correct Answer✔✔ D
Rationale: Forced draft fans push air into the furnace for combustion. They are located before the
furnace and create positive pressure in the combustion chamber.
Question 8
What does a steam trap remove from steam lines?
A) Steam
B) Condensate and air
C) Scale
D) Carbon dioxide
✔✔ Correct Answer✔✔ B
Rationale: Steam traps automatically discharge condensate while retaining steam. They also vent non-
condensable gases like air to maintain system efficiency.
Question 9
The purpose of a superheater is to:
A) Cool steam
B) Increase the temperature of steam above saturation
, 4
C) Reheat feedwater
D) Condense steam
✔✔ Correct Answer✔✔ B
Rationale: Superheaters raise steam temperature above saturation without increasing pressure.
Superheated steam is drier and has higher energy content for turbine efficiency.
Question 10
A "blowdown" is performed to:
A) Measure water temperature
B) Remove impurities and sludge from the boiler
C) Add feedwater automatically
D) Seal leaks
✔✔ Correct Answer✔✔ B
Rationale: Blowdown removes impurities and sediment that settle in the boiler, preventing scale
buildup and maintaining water quality.
Question 11
The maximum allowable working pressure (MAWP) is found on the:
A) Feedwater tank
B) Boiler nameplate
C) Pressure gauge
D) Water column
✔✔ Correct Answer✔✔ B
Rationale: The MAWP is stamped on the boiler nameplate as required by ASME Code. This is the
maximum pressure the boiler is designed to safely operate.
Question 12
When testing a safety valve, the pressure should:
A) Exceed the MAWP by 20%
B) Be reduced to zero
C) Be raised until the valve pops at its set pressure
D) Be manually released
✔✔ Correct Answer✔✔ C
Rationale: Proper testing requires raising pressure until the safety valve "pops" open at its designated
set pressure to ensure reliable operation.
