BC Boilermaker Certification Exam Practice
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
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1. What is the primary purpose of a boiler’s safety valve?
A) Increase pressure
B) Maintain temperature
C) Prevent overpressure
D) Control fuel flow
The safety valve releases excess pressure to prevent boiler
explosions.
2. Which type of welding is most commonly used in boiler
construction?
A) MIG
B) SMAW (Shielded Metal Arc Welding)
C) TIG
D) Oxy-acetylene
SMAW is widely used for its versatility and suitability for thick steel
plates.
3. What is the minimum thickness for a boiler shell plate subjected
to high pressure?
A) 3 mm
B) 5 mm
C) 6 mm
, D) 10 mm
Regulatory codes specify minimum thickness to withstand design
pressure safely.
4. Which of the following is a common defect in boiler welds?
A) Cracking
B) Porosity
C) Lack of fusion
D) All of the above
Cracking, porosity, and lack of fusion are typical defects that
compromise weld integrity.
5. When inspecting a boiler, which method is used to detect surface
cracks?
A) Radiographic testing
B) Ultrasonic testing
C) Magnetic particle testing
D) Hydrostatic testing
Magnetic particle testing highlights surface and slightly subsurface
cracks in ferromagnetic materials.
6. What is the purpose of a blowdown in a boiler?
A) Increase pressure
B) Heat water
C) Remove sediment and impurities
D) Lubricate pumps
Blowdown helps maintain water quality and prevent scaling and
corrosion.
7. Which fuel is most commonly used in industrial boilers?
A) Natural gas
, B) Oil
C) Coal
D) All of the above
Boilers can be designed for different fuels depending on
application and availability.
8. What does the term “superheater” refer to?
A) Device to heat air
B) Device to raise steam temperature above saturation
C) Steam drum
D) Condensate return unit
Superheaters increase the energy of steam, improving efficiency.
9. Which code governs boiler construction in Canada?
A) ASME B31.1
B) ISO 9001
C) CSA B51
D) API 650
CSA B51 sets standards for boiler and pressure vessel construction
and inspection in Canada.
10. What is the primary function of the economizer in a boiler?
A) Control steam pressure
B) Preheat feedwater using flue gases
C) Remove sludge
D) Reduce fuel consumption directly
Economizers improve efficiency by using waste heat to preheat
incoming water.
11. What type of boiler is commonly used in power plants?
A) Fire-tube boiler
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of a boiler’s safety valve?
A) Increase pressure
B) Maintain temperature
C) Prevent overpressure
D) Control fuel flow
The safety valve releases excess pressure to prevent boiler
explosions.
2. Which type of welding is most commonly used in boiler
construction?
A) MIG
B) SMAW (Shielded Metal Arc Welding)
C) TIG
D) Oxy-acetylene
SMAW is widely used for its versatility and suitability for thick steel
plates.
3. What is the minimum thickness for a boiler shell plate subjected
to high pressure?
A) 3 mm
B) 5 mm
C) 6 mm
, D) 10 mm
Regulatory codes specify minimum thickness to withstand design
pressure safely.
4. Which of the following is a common defect in boiler welds?
A) Cracking
B) Porosity
C) Lack of fusion
D) All of the above
Cracking, porosity, and lack of fusion are typical defects that
compromise weld integrity.
5. When inspecting a boiler, which method is used to detect surface
cracks?
A) Radiographic testing
B) Ultrasonic testing
C) Magnetic particle testing
D) Hydrostatic testing
Magnetic particle testing highlights surface and slightly subsurface
cracks in ferromagnetic materials.
6. What is the purpose of a blowdown in a boiler?
A) Increase pressure
B) Heat water
C) Remove sediment and impurities
D) Lubricate pumps
Blowdown helps maintain water quality and prevent scaling and
corrosion.
7. Which fuel is most commonly used in industrial boilers?
A) Natural gas
, B) Oil
C) Coal
D) All of the above
Boilers can be designed for different fuels depending on
application and availability.
8. What does the term “superheater” refer to?
A) Device to heat air
B) Device to raise steam temperature above saturation
C) Steam drum
D) Condensate return unit
Superheaters increase the energy of steam, improving efficiency.
9. Which code governs boiler construction in Canada?
A) ASME B31.1
B) ISO 9001
C) CSA B51
D) API 650
CSA B51 sets standards for boiler and pressure vessel construction
and inspection in Canada.
10. What is the primary function of the economizer in a boiler?
A) Control steam pressure
B) Preheat feedwater using flue gases
C) Remove sludge
D) Reduce fuel consumption directly
Economizers improve efficiency by using waste heat to preheat
incoming water.
11. What type of boiler is commonly used in power plants?
A) Fire-tube boiler
