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Louisiana (New Orleans) Second Class Stationary Boilers
Practice Exam (661 ‑ LA)
This 200‑question practice exam is designed to help candidates prepare for the Louisiana Second Class Stationary Engineer license (661‑LA). The questions are based on the official exam content outline from the Louisiana State Licensing Board for Contractors (LSLBC) and relevant codes, including the ASME Boiler and Pressure Vessel Code, the National Board Inspection Code (NBIC), and general engineering principles. Each question includes the correct answer and a detailed rationale.
SECTION 1: REGULATIONS, CODES & LICENSING (Qs 1–35) Q1. Which agency issues the Second Class Stationary Boilers license in Louisiana? A) Louisiana Department of Environmental Quality (LDEQ) B) Louisiana State Licensing Board for Contractors (LSLBC) C) Louisiana Workforce Commission (LWC) D) Louisiana Department of Natural Resources (DNR) Correct Answer: B Rationale: The Louisiana State Licensing Board for Contractors (LSLBC) is responsible for licensing stationary engineers. According to Louisiana Revised Statute 37:2165 et seq., the LSLBC issues licenses for stationary engineers who operate boilers in the state【29†L6-L12】. Q2. What is the minimum horsepower requirement for a boiler to be considered in the scope of the Second Class license? A) 100 HP
B) 150 HP
C) 200 HP
D) 500 HP
Correct Answer: B Rationale: The Louisiana statutory definition includes boilers exceeding 150 horsepower within the scope of the Second Class license. This aligns with the licensing structure for stationary engineers in the state【29†L22-L26】. Q3. How many years of verifiable experience are typically required to qualify for the Second Class Boiler license examination? A) 1 year B) 2 years C) 3 years D) 5 years Correct Answer: C Rationale: To qualify for the examination, an applicant must provide certified statements from employers showing at least three years of experience working with boilers of the class for which they are applying. This ensures candidates have sufficient practical knowledge【29†L18-L24】. Q4. The ASME Boiler and Pressure Vessel Code (BPVC) is divided into sections. Which section covers the rules for construction of power boilers? A) Section I B) Section II C) Section IV D) Section VIII
requirements for repair and alteration activities, including welding, post‑weld heat treatment, and documentation【33†L35-L41】. Q7. A boiler that operates at a steam pressure not exceeding 15 psi is classified as: A) Power boiler B) High‑pressure boiler C) Low‑pressure heating boiler D) Unfired pressure vessel Correct Answer: C Rationale: Low‑pressure heating boilers are designed for steam pressures not exceeding 15 psig. These are commonly used for building heating systems, not for power generation. The ASME Code provides separate rules for these in Section IV【32†L10-L17】. Q8. Who is responsible for ensuring that a boiler has a valid inspection certificate before it is placed into service? A) The boiler operator B) The boiler manufacturer C) The owner or user D) The insurance company Correct Answer: C Rationale: The owner or user of a boiler is legally responsible for obtaining a valid certificate of inspection before placing the boiler into service. This is enforced by jurisdictional authorities, often through state boiler inspection programs【33†L54-L62】. Q9. What does ASME Code Symbol Stamp “S” signify on a boiler? A) The boiler is a miniature boiler
B) The boiler is a power boiler C) The boiler is a heating boiler D) The boiler is a pressure vessel Correct Answer: B Rationale: An “S” stamp on a boiler indicates that the boiler has been constructed in accordance with ASME Section I for power boilers. This stamp is applied by the manufacturer after passing all required inspections and tests【31†L18-L26】. Q10. The primary code governing boiler repairs and alterations after the original installation is: A) ASME Section I B) ASME Section II C) NBIC (National Board Inspection Code) D) ASME Section VIII Correct Answer: C Rationale: Once a boiler is in service, the NBIC (National Board Inspection Code) provides the rules for maintenance, repair, alteration, and re‑rating. The NBIC is used by inspectors and repair organizations to ensure that repairs meet nationally recognized standards【33†L35- L41】. Q11. Under the NBIC, any repair or alteration to a boiler must be performed by: A) The boiler operator B) An “R” stamp holder C) The original manufacturer only D) Any licensed plumber
Q14. Under Louisiana law, who is ultimately responsible for the safe operation of a boiler? A) The boiler manufacturer B) The boiler operator C) The owner or user D) The insurance inspector Correct Answer: C Rationale: Louisiana Revised Statute 37:2165 places ultimate responsibility on the owner or user to ensure that boilers are operated safely and in compliance with all applicable codes and regulations. The operator and inspectors have important roles, but the owner/user is legally accountable【29†L24-L32】. Q15. A “stationary engineer” license in Louisiana is required for any person who: A) Designs a boiler B) Manufactures a boiler C) Operates a boiler for more than 8 hours per week D) Repairs a boiler Correct Answer: C Rationale: Under Louisiana law, any person who operates a boiler for more than 8 hours per week must hold a valid stationary engineer license. This is enforced to ensure only qualified individuals operate these potentially hazardous machines【29†L22-L26】. Q16. If a boiler’s safety valve lifts at a pressure lower than its set point, what is the most likely cause? A) The valve is too small B) The valve is seized or has debris under the seat C) The boiler pressure is too low
D) The valve is not required Correct Answer: B Rationale: Debris under the seat or a seized valve can prevent the valve from closing properly, causing it to leak or lift at a pressure lower than the set point. Regular testing and maintenance can help prevent this issue. A correctly operating safety valve should pop open at or slightly above its set pressure. Q17. According to the ASME Code, the safety valve capacity for a boiler must be sufficient to discharge: A) 50% of the boiler’s maximum steam output B) 75% of the boiler’s maximum steam output C) 100% of the boiler’s maximum steam output D) 150% of the boiler’s maximum steam output Correct Answer: C Rationale: ASME Section I requires that the total relieving capacity of the safety valves on a boiler be at least equal to the maximum steam output of the boiler at its MAWP. This ensures that the boiler cannot produce steam faster than the safety valves can relieve, preventing over‑pressurization【31†L30-L37】. Q18. Which section of the ASME Code covers welding qualifications for boiler construction? A) Section I B) Section II C) Section IX D) Section VIII Correct Answer: C
Q21. A low‑pressure heating boiler has a MAWP of 160 psig for water. Is this allowed under ASME Section IV? A) Yes, because low‑pressure boilers can be rated up to 160 psig B) Yes, but only for hot water heating boilers C) No, the limit is 160 psig only for water, which is allowed D) No, the limit for low‑pressure heating boilers is 160 psig for water, which is allowed, so the limit is 160 psi, not 150. The limit for steam is 15 psig. For water, the MAWP must not exceed 160 psig or 250°F maximum outlet temperature. Correct Answer: D Rationale: Low‑pressure heating boilers are limited to a steam pressure of 15 psig or a water pressure of 160 psig with a maximum temperature of 250°F. Therefore, a water pressure of 160 psig is permissible under Section IV【32†L10-L17】. Q22. An applicant who has been licensed in another state for 5 years wishes to obtain a Louisiana license without examination. What is the requirement? A) No reciprocity exists; they must take the Louisiana exam. B) They must provide proof of passing a national exam and pay the fee. C) They must take a short refresher course. D) They automatically qualify for a Louisiana license. Correct Answer: B Rationale: Louisiana law allows reciprocity for applicants who have passed a national examination such as the National Institute for the Uniform Licensing of Power Engineers (NIULPE) exam and hold a valid license in another state. They must provide proof and pay the required fee【29†L30-L38】. Q23. The purpose of a hydrostatic test on a boiler is to: A) Measure the boiler’s efficiency
B) Verify the integrity of the pressure boundary C) Adjust the safety valve set point D) Clean the internal surfaces Correct Answer: B Rationale: A hydrostatic test involves filling the boiler with water and pressurizing it to a level above the MAWP. This test confirms that the pressure boundary (shell, tubes, headers, etc.) can safely withstand pressure without leaking. It is required after new construction, repairs, or alterations. Q24. The “NB” symbol on a boiler certification plate indicates: A) The boiler was built in Nebraska B) The boiler has been registered with the National Board C) The boiler is a nuclear boiler D) The boiler is not certified Correct Answer: B Rationale: The “NB” symbol on a certification plate indicates that the boiler is registered with the National Board of Boiler and Pressure Vessel Inspectors. This is usually required for boilers that will be installed in jurisdictions that have adopted the NBIC【31†L18-L26】. Q25. According to NBIC rules, an “alteration” is defined as any change in the boiler that: A) Uses different spare parts B) Changes the design or pressure‑retaining capability C) Is performed by a certified welder D) Requires a hydrostatic test
Q28. A “Code” boiler is one that: A) Has been built to a recognized standard and stamped accordingly B) Has been approved by the owner C) Has been inspected by an insurance company D) Has been painted a specific color Correct Answer: A Rationale: A “Code” boiler is constructed in accordance with the ASME Boiler and Pressure Vessel Code and bears the appropriate ASME symbol stamp. This ensures that the boiler meets minimum safety standards for design, materials, and construction. Q29. An “R” stamp holder is authorized to: A) Perform repairs and alterations on boilers B) Perform only routine maintenance C) Only inspect boilers D) Only install new boilers Correct Answer: A Rationale: The NBIC “R” stamp is issued to organizations that have demonstrated the capability to perform repairs and alterations on boilers and pressure vessels in accordance with NBIC rules. It does not authorize new construction or inspection work. Q30. To perform welding on a boiler, the welder must hold a certification as required by: A) ASME Section I B) ASME Section IX C) ASME Section IV D) NBIC Part 3
Correct Answer: B Rationale: ASME Section IX sets forth the requirements for qualification of welders and welding procedures for all ASME Code construction, including boilers. Welders must pass qualification tests to be certified for the specific welding processes and materials they will use. Q31. In Louisiana, the Second Class license is often considered the “all‑around” boiler license because: A) It is the only license required B) It allows the holder to operate any boiler in the state C) It covers the widest range of boiler types and sizes D) It is the easiest to obtain Correct Answer: C Rationale: The Second Class license is designed to cover the broadest range of stationary boilers, including both firetube and watertube boilers of various sizes. It is the license most commonly held by operating engineers in Louisiana. Q32. Louisiana licensing law requires that a copy of the boiler operator’s license be: A) Kept in the boiler operator’s wallet B) Posted in the boiler room C) Filed with the local fire department D) Kept in the employer’s human resources office Correct Answer: B Rationale: Under Louisiana Administrative Code (LAC) 37:VI.309, a copy of the current license of each stationary engineer on duty must be posted in the boiler room. This allows inspectors to quickly verify that only qualified personnel are operating the equipment.
C) 20 inches D) 24 inches Correct Answer: B Rationale: ASME Section I defines a miniature boiler as a power boiler with a maximum inside diameter of 16 inches or a volume of 5 cubic feet. These boilers are subject to special rules because of their small size【31†L30-L37】.
SECTION 2: BOILER SYSTEMS, COMPONENTS & OPERATION (Qs 36–85) Q36. In a firetube boiler, hot gases travel: A) Through the tubes, while water is on the outside of the tubes B) Through the water space, while tubes carry steam C) Through the shell, while water is in the tubes D) Through the boiler furnace only Correct Answer: A Rationale: In a firetube boiler, the combustion gases pass through the tubes, and the water surrounds the tubes. This design is commonly used for low‑ and medium‑pressure steam applications because it is relatively simple and compact. Q37. Which of the following is an advantage of a watertube boiler over a firetube boiler? A) Lower cost for small applications B) Faster response to load changes C) Easier to clean the water side
D) Simpler to construct Correct Answer: B Rationale: Watertube boilers have a smaller water volume relative to their heating surface, which allows them to respond to load changes more quickly. This is especially important in variable‑load industrial processes. Firetube boilers have a larger water volume and tend to be more sluggish. Q38. The component that transfers heat from the combustion gases to the water in a boiler is called the: A) Burner B) Heating surface C) Furnace D) Breeching Correct Answer: B Rationale: The term “heating surface” refers to any part of the boiler that has water on one side and hot gases on the other. The efficiency and capacity of a boiler are often expressed in terms of heating surface area (e.g., square feet of heating surface per horsepower). Q39. What is the function of a “boiler economizer”? A) To preheat the combustion air B) To preheat the feedwater using waste flue gas heat C) To preheat the fuel D) To reduce steam pressure Correct Answer: B
B) Watertube boiler C) Cast iron sectional boiler D) Electric boiler Correct Answer: C Rationale: Cast iron sectional boilers are made of individual cast iron sections bolted together. Cast iron is brittle and can crack if subjected to sudden temperature changes (thermal shock). This is why warm‑up procedures are critical for cast iron boilers. Q43. The function of a “superheater” is to: A) Increase the pressure of the steam B) Increase the temperature of the steam above the saturation point C) Preheat the feedwater D) Reduce the moisture content of the steam Correct Answer: B Rationale: A superheater is a heat exchanger that further heats saturated steam, raising its temperature above the boiling point at the existing pressure. Superheated steam is used in turbines and some industrial processes to improve efficiency and prevent condensation damage. Q44. What is the purpose of a “desuperheater” in a steam system? A) To increase steam temperature B) To reduce steam temperature for process requirements C) To preheat combustion air D) To remove solids from steam
Correct Answer: B Rationale: A desuperheater (or attemperator) injects water into superheated steam to lower its temperature to a desired level. This is often required to protect downstream equipment that cannot tolerate high temperatures. Q45. Which type of burner mixes fuel and air completely before combustion occurs? A) Premix burner B) Raw gas burner C) Nozzle mix burner D) Ring burner Correct Answer: A Rationale: In a premix burner, fuel and primary air are mixed before they enter the combustion zone. This results in a shorter, more intense flame. Raw gas burners mix fuel and air at the point of combustion. Q46. The term “refractory” in a boiler refers to: A) The water level gauge glass B) The heat‑resistant lining inside the furnace C) The safety valve D) The blowdown valve Correct Answer: B Rationale: Refractory is a heat‑resistant material (such as firebrick or castable refractory) used to line the furnace and other hot areas of a boiler. It protects the metal surfaces from excessive heat and helps maintain proper combustion temperatures. Q47. What is the purpose of a “soot blower” in a boiler?
