2026 NYC STATIONARY
ENGINEER HIGH PRESSURE
BOILER LICENSE EXAM TEST
LATEST MOCK PRACTICE SET
135 Questions with Answers and Detailed Rationales
100 PERCENT GUARANTEED PASS
INSTANT DOWNLOAD ANSWERS INCLUDED
IMPORTANCE OF THIS DOCUMENT
This comprehensive examination preparation guide has been meticulously developed to help you succeed in the
2026 NYC STATIONARY ENGINEER HIGH PRESSURE BOILER LICENSE EXAM TEST WITH LATEST
UPDATED (QUESTIONS AND ANSWERS) ALREADY PASSED!!. It contains 135 carefully selected questions
that reflect the most current exam content and testing strategies. Each question is accompanied by a correct
answer and a detailed rationale that explains the underlying pathophysiology, pharmacology, or clinical reasoning.
Self-Assessment – Test your knowledge and Exam Preparation – Familiarize yourself with the
identify areas requiring further question format and content
study areas
Concept Reinforcement – Deepen your Confidence Building – Develop test-taking
understanding through strategies and reduce
evidence-based exam anxiety
rationales
Time Management – Practice answering
questions under simulated
exam conditions
Review Summary 135 Questions
Foundations - Application - 2026 NYC Stationary Engineer HIGH Pressure Boiler License WITH Updated
AND Already Passed Stationary Engineering HIGH Pressure Boiler Operations Graduate / Professional
Certification
All answers with rationales
,Table of Contents
Content Area Questions Key Topics
2026 NYC Stationary 1-23 Boiler, Water, Pressure, Valve, Safety
Engineer HIGH Pressure
Boiler License WITH Updated
AND Already Passed
Stationary Engineering HIGH
Pressure Boiler Operations
Graduate / Professional
Certification
Pressure 24-46 Boiler, High-pressure, Valve, Steam, Water
Valve 47-69 Boiler, Pressure, Cause, Steam, Safety
Water 70-92 Boiler, Valve, Blowdown, Feedwater, Steam
Steam 93-115 Boiler, Pressure, Water, Level, Safety
Safety 116-135 Boiler, High-pressure, Valve, Steam, Maximum Allowable
TOTAL 135 All questions include answers and detailed rationales
,Section A - 2026 NYC Stationary Engineer HIGH Pressure
Boiler License WITH Updated AND Already Passed
Stationary Engineering HIGH Pressure Boiler Operations
Graduate / Professional Certification
Q1.
A high-pressure steam boiler operates at 150 psig. The low-water cutoff is installed at the
minimum safe water level. During a sudden steam demand increase, pressure drops and
water level rises. What is the primary reason for the water level rise?
A. Increased feedwater flow due to the level B. Swelling of the water level due to lower
controller pressure causing increased steam bubble
volume
C. Condensate return suddenly increasing D. Thermal expansion of the boiler metal
the water mass causing the water level to rise
Correct: B - Swelling of the water level due to lower pressure causing increased steam
bubble volume
Rationale:When steam pressure drops rapidly, the saturation temperature decreases,
causing more flashing of water into steam bubbles. This increases the volume of the
water-steam mixture, making the level appear to rise-a phenomenon known as swell.
Feedwater flow may increase, but that is a response to level, not the primary cause.
Condensate return and metal expansion are not immediate factors.
Q2.
According to ASME Boiler and Pressure Vessel Code Section I, which factor determines
the required thickness of a boiler shell subjected to internal pressure?
A. Yield strength of the material at room B. Ultimate tensile strength divided by a
temperature safety factor of 5
C. Maximum allowable working pressure, D. The hydrostatic test pressure multiplied
inside radius, and allowable stress by a factor of 1.5
Correct: C - Maximum allowable working pressure, inside radius, and allowable stress
Rationale:ASME Section I formula for minimum shell thickness is t = (P * R) / (S * E - 0.6P),
where P is MAWP, R is inside radius, S is allowable stress (based on tensile strength at
temperature), and E is joint efficiency. Yield strength alone is not used; allowable stress
accounts for temperature and safety factors. Hydrostatic test pressure is for testing, not
design.
Page 3
, Section A - 2026 NYC Stationary Engineer HIGH Pressure Boiler License WITH Updated AND Already Passed Stationary Engineering HIGH
Pressure Boiler Operations Graduate / Professional Certification
Q3.
A boiler's feedwater has a pH of 8.5 and a conductivity of 10 µS/cm. To prevent scale and
corrosion in a high-pressure boiler, which treatment strategy is most appropriate?
A. Add sodium sulfite to scavenge oxygen B. Increase blowdown to reduce silica
and maintain phosphate residual concentration
C. Use a chelating agent such as EDTA D. Switch to a coordinated phosphate
without pH adjustment treatment with a lower pH
Correct: A - Add sodium sulfite to scavenge oxygen and maintain phosphate residual
Rationale:High-pressure boilers require oxygen removal (via sulfite or hydrazine) and pH
control to prevent corrosion. Phosphate treatment precipitates hardness. Silica control is
important but pH and oxygen are primary. Chelants require careful pH control; lowering pH
would increase corrosion risk.
Q4.
During a burner startup sequence, the flame scanner fails to detect a flame within 15
seconds after the main fuel valve opens. What is the immediate safety action?
A. Close the main fuel valve and initiate a B. Re-ignition attempt with a longer
purge cycle trial-for-ignition period
C. Open the vent valve to relieve pressure D. Shut down the burner and require manual
and continue monitoring reset of the flame safeguard
Correct: D - Shut down the burner and require manual reset of the flame safeguard
Rationale:On loss of flame or failure to establish flame, the flame safeguard must shut the
fuel valves and lock out, requiring manual reset to prevent fuel accumulation and explosion. A
purge cycle is not initiated immediately; that occurs after lockout. Automatic re-ignition is not
permitted after a flame failure in most codes.
Q5.
A boiler is operating at 300 psig. The safety valve is set at 300 psig with an accumulation
of 6%. What is the maximum allowable pressure during a safety valve discharge?
A. 318 psig B. 315 psig
C. 306 psig D. 330 psig
Correct: A - 318 psig
Rationale:ASME Code permits a maximum pressure of 106% of MAWP (300 psig) during
safety valve discharge, which is 318 psig. 6% accumulation is allowed over MAWP. 315 psig
is 5%, 306 is 2%, 330 is 10%-not correct.
Page 4
ENGINEER HIGH PRESSURE
BOILER LICENSE EXAM TEST
LATEST MOCK PRACTICE SET
135 Questions with Answers and Detailed Rationales
100 PERCENT GUARANTEED PASS
INSTANT DOWNLOAD ANSWERS INCLUDED
IMPORTANCE OF THIS DOCUMENT
This comprehensive examination preparation guide has been meticulously developed to help you succeed in the
2026 NYC STATIONARY ENGINEER HIGH PRESSURE BOILER LICENSE EXAM TEST WITH LATEST
UPDATED (QUESTIONS AND ANSWERS) ALREADY PASSED!!. It contains 135 carefully selected questions
that reflect the most current exam content and testing strategies. Each question is accompanied by a correct
answer and a detailed rationale that explains the underlying pathophysiology, pharmacology, or clinical reasoning.
Self-Assessment – Test your knowledge and Exam Preparation – Familiarize yourself with the
identify areas requiring further question format and content
study areas
Concept Reinforcement – Deepen your Confidence Building – Develop test-taking
understanding through strategies and reduce
evidence-based exam anxiety
rationales
Time Management – Practice answering
questions under simulated
exam conditions
Review Summary 135 Questions
Foundations - Application - 2026 NYC Stationary Engineer HIGH Pressure Boiler License WITH Updated
AND Already Passed Stationary Engineering HIGH Pressure Boiler Operations Graduate / Professional
Certification
All answers with rationales
,Table of Contents
Content Area Questions Key Topics
2026 NYC Stationary 1-23 Boiler, Water, Pressure, Valve, Safety
Engineer HIGH Pressure
Boiler License WITH Updated
AND Already Passed
Stationary Engineering HIGH
Pressure Boiler Operations
Graduate / Professional
Certification
Pressure 24-46 Boiler, High-pressure, Valve, Steam, Water
Valve 47-69 Boiler, Pressure, Cause, Steam, Safety
Water 70-92 Boiler, Valve, Blowdown, Feedwater, Steam
Steam 93-115 Boiler, Pressure, Water, Level, Safety
Safety 116-135 Boiler, High-pressure, Valve, Steam, Maximum Allowable
TOTAL 135 All questions include answers and detailed rationales
,Section A - 2026 NYC Stationary Engineer HIGH Pressure
Boiler License WITH Updated AND Already Passed
Stationary Engineering HIGH Pressure Boiler Operations
Graduate / Professional Certification
Q1.
A high-pressure steam boiler operates at 150 psig. The low-water cutoff is installed at the
minimum safe water level. During a sudden steam demand increase, pressure drops and
water level rises. What is the primary reason for the water level rise?
A. Increased feedwater flow due to the level B. Swelling of the water level due to lower
controller pressure causing increased steam bubble
volume
C. Condensate return suddenly increasing D. Thermal expansion of the boiler metal
the water mass causing the water level to rise
Correct: B - Swelling of the water level due to lower pressure causing increased steam
bubble volume
Rationale:When steam pressure drops rapidly, the saturation temperature decreases,
causing more flashing of water into steam bubbles. This increases the volume of the
water-steam mixture, making the level appear to rise-a phenomenon known as swell.
Feedwater flow may increase, but that is a response to level, not the primary cause.
Condensate return and metal expansion are not immediate factors.
Q2.
According to ASME Boiler and Pressure Vessel Code Section I, which factor determines
the required thickness of a boiler shell subjected to internal pressure?
A. Yield strength of the material at room B. Ultimate tensile strength divided by a
temperature safety factor of 5
C. Maximum allowable working pressure, D. The hydrostatic test pressure multiplied
inside radius, and allowable stress by a factor of 1.5
Correct: C - Maximum allowable working pressure, inside radius, and allowable stress
Rationale:ASME Section I formula for minimum shell thickness is t = (P * R) / (S * E - 0.6P),
where P is MAWP, R is inside radius, S is allowable stress (based on tensile strength at
temperature), and E is joint efficiency. Yield strength alone is not used; allowable stress
accounts for temperature and safety factors. Hydrostatic test pressure is for testing, not
design.
Page 3
, Section A - 2026 NYC Stationary Engineer HIGH Pressure Boiler License WITH Updated AND Already Passed Stationary Engineering HIGH
Pressure Boiler Operations Graduate / Professional Certification
Q3.
A boiler's feedwater has a pH of 8.5 and a conductivity of 10 µS/cm. To prevent scale and
corrosion in a high-pressure boiler, which treatment strategy is most appropriate?
A. Add sodium sulfite to scavenge oxygen B. Increase blowdown to reduce silica
and maintain phosphate residual concentration
C. Use a chelating agent such as EDTA D. Switch to a coordinated phosphate
without pH adjustment treatment with a lower pH
Correct: A - Add sodium sulfite to scavenge oxygen and maintain phosphate residual
Rationale:High-pressure boilers require oxygen removal (via sulfite or hydrazine) and pH
control to prevent corrosion. Phosphate treatment precipitates hardness. Silica control is
important but pH and oxygen are primary. Chelants require careful pH control; lowering pH
would increase corrosion risk.
Q4.
During a burner startup sequence, the flame scanner fails to detect a flame within 15
seconds after the main fuel valve opens. What is the immediate safety action?
A. Close the main fuel valve and initiate a B. Re-ignition attempt with a longer
purge cycle trial-for-ignition period
C. Open the vent valve to relieve pressure D. Shut down the burner and require manual
and continue monitoring reset of the flame safeguard
Correct: D - Shut down the burner and require manual reset of the flame safeguard
Rationale:On loss of flame or failure to establish flame, the flame safeguard must shut the
fuel valves and lock out, requiring manual reset to prevent fuel accumulation and explosion. A
purge cycle is not initiated immediately; that occurs after lockout. Automatic re-ignition is not
permitted after a flame failure in most codes.
Q5.
A boiler is operating at 300 psig. The safety valve is set at 300 psig with an accumulation
of 6%. What is the maximum allowable pressure during a safety valve discharge?
A. 318 psig B. 315 psig
C. 306 psig D. 330 psig
Correct: A - 318 psig
Rationale:ASME Code permits a maximum pressure of 106% of MAWP (300 psig) during
safety valve discharge, which is 318 psig. 6% accumulation is allowed over MAWP. 315 psig
is 5%, 306 is 2%, 330 is 10%-not correct.
Page 4
