Boilermaker (Red Seal)
600 practice questions
Practice questions for the Boilermaker (Red Seal) exam, organized by Red Seal Occupational Standard (RSOS) section. 600 questions are available across 4 sections, each verified by our own review.
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Sections (RSOS blocks)
| Section | RSOS block | Exam weight | Questions |
|---|---|---|---|
| A | Performs Common Occupational Skills | 26% | 155 |
| B | Performs Rigging And Hoisting | 29% | 175 |
| C | Completes New Construction | 23% | 140 |
| D | Performs Repairs, Maintenance, Upgrading And Testing | 22% | 130 |
Mock exams are composed to match the official weightings above exactly — the question counts per section don't need to match 1:1.
Practice mock exam
The full practice mock for this trade is 120 questions, a 180-minute time limit, scored against a 70% pass line — the same question style used throughout this bank.
Sample questions
Performs Common Occupational Skills
Before servicing a feedwater pump, which procedure isolates the energy source and prevents accidental start-up?
- Lockout/tagout
- A verbal notice to the crew
- Applying a warning tag without a lock
- Switching off at the main panel only
Lockout/tagout physically isolates the energy source and applies a personal lock so the pump cannot be re-energized while a worker is exposed. A verbal notice does not stop someone from closing the disconnect, switching off alone leaves no positive lock, and a tag without a lock can be removed. The locked isolation is what guarantees the equipment stays dead during service.
RSOS 2017 | A-1.02 Uses personal protective equipment (PPE) and safety equipment
Performs Rigging And Hoisting
What is the generally accepted minimum safe sling angle measured from horizontal?
- 30 degrees
- 15 degrees
- 45 degrees
- 10 degrees
The minimum safe sling angle is 30 degrees from horizontal; below this the tension in each leg rises so steeply that the sling can be overloaded even by a modest load. Angles of 15, 10, or even setting the limit at 45 degrees do not match the accepted practice. Holding 30 degrees as the floor keeps leg tension within manageable limits.
RSOS 2017 | B-8.05 Performs hoisting and positioning operations
Completes New Construction
Which steel plate grade is the most common choice for carbon-steel pressure vessel shells?
- A36 structural steel
- SA-516 Grade 70
- Plain cast iron
- SA-516 Grade 60
SA-516 Grade 70 is the standard carbon-steel plate for pressure vessels because its tensile range of 485 to 620 megapascals gives good strength with reliable weldability and notch toughness. Structural A36 is not a pressure grade, the Grade 60 variant is lower strength, and cast iron is brittle and unsuitable. The Grade 70 plate is the workhorse of vessel shells.
RSOS 2017 | C-10.02 Cuts components for fabrication