Boilermaker Worker Certification Exam

Boilermaker Worker Certification Exam Practice Test Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• Which of the following is the most critical PPE when performing hot

work inside a boiler?

• Safety glasses
• Protective welding helmet
• Steel-toed boots
• Earplugs

Rationale: A welding helmet protects the eyes and face from sparks,

heat, and harmful radiation, which is essential during hot work.

• What is the primary purpose of a boiler’s safety valve?
• Increase pressure 1 / 4

• Prevent overpressure
• Measure water level
• Control fuel flow

Rationale: Safety valves automatically release pressure when it

exceeds safe limits, preventing explosions.

• Which welding process is commonly used for boiler plate fabrication?
• Oxy-acetylene welding
• Shielded Metal Arc Welding (SMAW)
• Gas Tungsten Arc Welding (GTAW)
• Laser welding

Rationale: SMAW is widely used in boiler construction due to its

portability and effectiveness on thick steel.

• When lifting heavy boiler components with a crane, what is the most

important factor?

• Speed of lifting
• Rope type
• Load weight and center of gravity
• Color of the rigging

Rationale: Knowing the weight and center of gravity ensures safe

lifting and prevents tipping or swinging hazards.

• Which type of boiler is typically used in industrial steam production?
• Electric boiler
• Fire-tube boiler 2 / 4

• Residential boiler
• Solar boiler

Rationale: Fire-tube boilers are commonly used in industrial settings

because they efficiently generate steam for various processes.

• What is the main reason to perform a hydrostatic test on a boiler?
• Check fuel efficiency
• Inspect the burner
• Detect leaks and structural integrity
• Verify insulation

Rationale: Hydrostatic tests pressurize the boiler with water to

ensure it can handle operational pressures without leaking.

• Which blueprint symbol indicates a weld joint?
• Circle
• Square
• Triangle
• Rectangle

Rationale: In welding blueprints, a triangle often represents a fillet

weld joint.

• During welding, a crack appears along the joint. What is the most likely

cause?

• Excessive shielding gas
• Improper preheating or rapid cooling
• Correct electrode selection 3 / 4

• Proper joint fit-up

Rationale: Thermal stress from improper preheating or rapid cooling

can cause weld cracking.

• Which type of steel is most commonly used in boiler construction?
• Stainless steel
• Cast iron
• Carbon steel
• Aluminum

Rationale: Carbon steel has the strength and heat resistance needed

for boiler plates.

• What is the maximum allowable working pressure for a typical

low-pressure boiler?

• 10 psi
• 50 psi
• 15 psi
• 100 psi

Rationale: Low-pressure boilers are designed for pressures not

exceeding 15 psi for safety and regulatory compliance.

• Which of the following is the safest method for handling hot

metal during fabrication?

• Bare hands
• Heat-resistant gloves and tongs
• Cotton gloves
• / 4