, MARYLAND STATIONARY ENGINEER GRADE 1 EXAM
Complete Practice Test Bank | 250 Questions with Verified
Answers & Detailed Rationales | Updated 2026
EXAM OVERVIEW & KEY INFORMATION
The Maryland Stationary Engineer Grade 1 License is the highest level of certification
in Maryland, authorizing the operation of high-pressure steam systems exceeding 500
horsepower (HP) . This exam is administered by the Maryland Board of Stationary
Engineers through PSI Examination Services .
Exam Details:
• Number of Questions: 80
• Minimum Passing Score: 70% (56 items correct)
• Time Allowed: 120 minutes
• Exam Format: Closed book
Qualification Requirements:
• Five years of documented experience as an active Grade 2 stationary engineer under the
direction and control of a Grade 1 stationary engineer
• OR: One year of documented experience as a professional engineer
• OR: A combination of education and experience as determined by the Board
License Renewal: Maryland stationary engineer licenses expire on a biennial basis
(every 2 years)
Content Outline (PSI Exam Blueprint):
Subject Area # of Items
General Knowledge and Problem Solving 5
,Subject Area # of Items
Basic Electricity 5
Boiler Types and Equipment 5
Burners and Fuel Train 10
Pumps and Valves 10
Sequential Operations 10
Inspections and Maintenance 10
Central Station and Chillers 5
Water Treatment 10
Emergency Operations 5
Auxiliary Equipment 5
SECTION 1: LICENSING, REGULATIONS & PLANT
MANAGEMENT (Questions 1–30)
1. According to the Maryland Stationary Engineers Act (Title 6.5), which license
grade is required to supervise a facility with a single boiler rated at 450 boiler
horsepower (BHP)?
A) Grade 1
B) Grade 2
, C) Grade 3
K K
D) Grade 4
K K
Answer: B (Grade 2) K K K
Rationale: Under COMAR 09.12.01, a Grade 2 license is required for facilities where the
K K K K K K K K K K K K K
largest single boiler exceeds 300 BHP but is less than 500 BHP. Grade 1 is required for
K K K K K K K K K K K K K K K K K
≥500 BHP. Grades 3 and 4 are for smaller installations .
K K K K K K K K K K K
2. A stationary engineer with a Grade 1 license may perform which of the following
K K K K K K K K K K K K K K
without additional certification?
K K K
A) Weld repairs on a pressure vessel
K K K K K K
B) Operate a 600 BHP high-pressure boiler
K K K K K K
C) Install a new gas regulator
K K K K K
D) Perform major electrical work
K K K K
Answer: B K
Rationale: The Grade 1 license authorizes operation of boilers of any size. Welding, gas
K K K K K K K K K K K K K
fitting, and electrical work require separate trade licenses .
K K K K K K K K K
3. Under Maryland law, a stationary engineer's license must be renewed every:
K K K K K K K K K K K
A) 1 year
K K
B) 2 years
K K
C) 3 years
K K
D) 5 years
K K
Answer: B K
Rationale: Maryland stationary engineer licenses expire on a biennial basis (every 2
K K K K K K K K K K K
years). Continuing education is required for renewal .
K K K K K K K K
Complete Practice Test Bank | 250 Questions with Verified
Answers & Detailed Rationales | Updated 2026
EXAM OVERVIEW & KEY INFORMATION
The Maryland Stationary Engineer Grade 1 License is the highest level of certification
in Maryland, authorizing the operation of high-pressure steam systems exceeding 500
horsepower (HP) . This exam is administered by the Maryland Board of Stationary
Engineers through PSI Examination Services .
Exam Details:
• Number of Questions: 80
• Minimum Passing Score: 70% (56 items correct)
• Time Allowed: 120 minutes
• Exam Format: Closed book
Qualification Requirements:
• Five years of documented experience as an active Grade 2 stationary engineer under the
direction and control of a Grade 1 stationary engineer
• OR: One year of documented experience as a professional engineer
• OR: A combination of education and experience as determined by the Board
License Renewal: Maryland stationary engineer licenses expire on a biennial basis
(every 2 years)
Content Outline (PSI Exam Blueprint):
Subject Area # of Items
General Knowledge and Problem Solving 5
,Subject Area # of Items
Basic Electricity 5
Boiler Types and Equipment 5
Burners and Fuel Train 10
Pumps and Valves 10
Sequential Operations 10
Inspections and Maintenance 10
Central Station and Chillers 5
Water Treatment 10
Emergency Operations 5
Auxiliary Equipment 5
SECTION 1: LICENSING, REGULATIONS & PLANT
MANAGEMENT (Questions 1–30)
1. According to the Maryland Stationary Engineers Act (Title 6.5), which license
grade is required to supervise a facility with a single boiler rated at 450 boiler
horsepower (BHP)?
A) Grade 1
B) Grade 2
, C) Grade 3
K K
D) Grade 4
K K
Answer: B (Grade 2) K K K
Rationale: Under COMAR 09.12.01, a Grade 2 license is required for facilities where the
K K K K K K K K K K K K K
largest single boiler exceeds 300 BHP but is less than 500 BHP. Grade 1 is required for
K K K K K K K K K K K K K K K K K
≥500 BHP. Grades 3 and 4 are for smaller installations .
K K K K K K K K K K K
2. A stationary engineer with a Grade 1 license may perform which of the following
K K K K K K K K K K K K K K
without additional certification?
K K K
A) Weld repairs on a pressure vessel
K K K K K K
B) Operate a 600 BHP high-pressure boiler
K K K K K K
C) Install a new gas regulator
K K K K K
D) Perform major electrical work
K K K K
Answer: B K
Rationale: The Grade 1 license authorizes operation of boilers of any size. Welding, gas
K K K K K K K K K K K K K
fitting, and electrical work require separate trade licenses .
K K K K K K K K K
3. Under Maryland law, a stationary engineer's license must be renewed every:
K K K K K K K K K K K
A) 1 year
K K
B) 2 years
K K
C) 3 years
K K
D) 5 years
K K
Answer: B K
Rationale: Maryland stationary engineer licenses expire on a biennial basis (every 2
K K K K K K K K K K K
years). Continuing education is required for renewal .
K K K K K K K K
