100+ Free MN Boiler Operator Practice Questions
Pass your Minnesota Boiler Engineer License Exam exam on the first try — instant access, no signup required.
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Key Facts: MN Boiler Operator Exam
70%
Passing Score
MN DLI
$50
Exam Fee
MN DLI
2 hrs
Time Limit
MN DLI exam
6 Grades
License Levels
MN DLI
Minnesota requires a 70% passing score on a state-administered written exam. The $50 exam fee applies to all grades. Minnesota uses a multi-grade system: Chief, 1st, 2nd, 3rd, 4th, and 5th Class Engineer. Each grade has specific operating-hour requirements verified by affidavit. Higher grades authorize operation of larger and higher-pressure boiler systems. You must hold a lower grade before advancing.
About the MN Boiler Operator Exam
Minnesota's boiler engineer exam is administered by the Department of Labor and Industry. The state uses a grade-based licensing system with Chief Engineer and 1st through 5th Class Engineer levels. Candidates must submit an affidavit of operating experience and pay a $50 exam fee. The written exam covers boiler operations, safety systems, water treatment, combustion principles, and Minnesota-specific licensing regulations.
Questions
100 scored questions
Time Limit
2 hours
Passing Score
70%
Exam Fee
$50 (Minnesota Dept of Labor and Industry)
MN Boiler Operator Exam Content Outline
Boiler Operations
Startup, shutdown, normal operation, and operating procedures for steam and hot-water boilers
Safety & Emergency Procedures
Safety valves, low-water cutoffs, emergency shutdowns, and boiler room safety
Maintenance & Inspections
Routine maintenance, boiler inspections, cleaning, and repair procedures
Water Treatment & Combustion
Feedwater treatment, blowdown, water chemistry, fuel systems, and combustion control
Minnesota Regulations & Licensing
DLI licensing, engineer grade system, experience affidavit requirements, and state boiler code
How to Pass the MN Boiler Operator Exam
What You Need to Know
- Passing score: 70%
- Exam length: 100 questions
- Time limit: 2 hours
- Exam fee: $50
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
MN Boiler Operator Study Tips from Top Performers
Frequently Asked Questions
How much does the Minnesota boiler engineer exam cost?
The Minnesota boiler engineer exam costs $50 per attempt. This fee applies to all engineer grade levels — from 5th Class through Chief Engineer. The fee is payable to the Department of Labor and Industry when you schedule your exam.
What are the Minnesota boiler engineer grade levels?
Minnesota uses six grade levels: 5th Class (lowest), 4th Class, 3rd Class, 2nd Class, 1st Class, and Chief Engineer (highest). Each grade authorizes operation of progressively larger and higher-pressure boiler systems. You must meet specific operating-hour requirements and pass a written exam for each grade.
What experience documentation does Minnesota require?
Minnesota requires an affidavit of operating experience signed by your supervising licensed engineer. The affidavit must verify the hours you worked, the types of boilers operated, and the pressure ratings involved. Specific hour requirements vary by grade level.
Can I skip grade levels in Minnesota?
No. Minnesota requires you to hold each lower grade before advancing. You must start at 5th Class and work your way up, meeting the experience-hour requirements and passing the written exam at each grade level.