Maryland Stationary Engineer Grade 5 License Exam Prep 2026: Beginner Study Guide with 150+ Practice Questions, Detailed Explanations, 30–99 HP Limited Operation, Basic Boiler Safety, High School Diploma Pathway, and PSI Exam Strategies – First-Time Pa

Maryland Stationary Engineer Grade 5 License Exam Prep 2026: Beginner
Study Guide with 150+ Practice Questions, Detailed Explanations, 30–99
HP Limited Operation, Basic Boiler Safety, High School Diploma Pathway,
and PSI Exam Strategies – First-Time Pass Guarantee




SECTION 1: BOILER FUNDAMENTALS (Questions 1–25)
1. What is the maximum horsepower (HP) a Grade 5 stationary engineer is authorized to
operate in Maryland?

 A) 15 – 29 HP
 B) 30 – 99 HP
 C) 100 – 299 HP
 D) 300 – 499 HP

**Explanation: A Grade 5 license authorizes operation of boilers and equipment in the
range of 30 to 99 horsepower, but only in buildings not open for public use.




2. What is the minimum educational requirement to qualify for the Grade 5 examination?

 A) Associate degree
 B) High school diploma or GED

, C) Trade school certificate
 D) No requirement

**Explanation: The Grade 5 license requires only a high school diploma or GED. No
prior experience is needed.




3. In what type of building can a Grade 5 engineer operate a boiler?

 A) Any building
 B) Hospitals only
 C) Schools only
 D) Buildings not open for public use

**Explanation: A Grade 5 license is restricted to buildings not open for public use,
such as private industrial facilities or maintenance shops.




4. What is the purpose of a boiler?

 A) Generate electricity
 B) Generate steam or hot water for heating or process use
 C) Cool building air
 D) Compress air

**Explanation: Boilers produce steam or hot water by transferring heat from fuel
combustion to water.




5. What is the primary safety device that prevents boiler overpressure?

 A) Low-water cutoff
 B) Safety valve
 C) Pressure gauge

, D) Feedwater pump

**Explanation: The safety valve automatically opens to relieve pressure if it exceeds
the maximum allowable working pressure.




6. What is the purpose of a low-water fuel cutoff?

 A) Reduce fuel pressure
 B) Shut off fuel supply when water level drops below safe limits
 C) Increase feedwater flow
 D) Control steam pressure

**Explanation: A low-water fuel cutoff prevents the boiler from firing when water level is
dangerously low, avoiding tube overheating and failure.




7. What does a gauge glass indicate?

 A) Steam pressure
 B) Water level in the boiler
 C) Fuel flow
 D) Flue gas temperature

**Explanation: The gauge glass provides a direct visual indication of the water level,
essential for safe boiler operation.




8. How often should gauge glasses be blown down?

 A) Weekly
 B) At least once per shift or daily
 C) Monthly
 D) Annually

, **Explanation: Blowing down gauge glasses daily confirms that water passages are
clear and the water level indication is accurate.




9. What is the purpose of a try lever on a safety valve?

 A) Adjust pressure setting
 B) Manually test the valve operation
 C) Lock the valve closed
 D) Increase valve capacity

**Explanation: The try lever allows manual testing of the safety valve to ensure it is not
stuck and will open freely when required.




10. What is the first thing you should check before starting a boiler?

 A) Fuel pressure
 B) Water level in the gauge glass
 C) Steam pressure
 D) Stack temperature

**Explanation: Before any startup, the operator must confirm that the boiler has a safe
water level to prevent overheating.




11. What is the function of a steam pressure gauge?

 A) Measure water level
 B) Measure steam pressure inside the boiler
 C) Measure fuel flow
 D) Measure stack temperature

**Explanation: The pressure gauge indicates the operating pressure of the boiler.