Page 1 of 96
MD STATIONARY ENGINEER — GRADE 1 EXAM
QUESTIONS AND VERIFIED ANSWERS
MD STATIONARY ENGINEER — GRADE 1 EXAM
10 EXAM COVERAGE AREAS
1. Boilers, boiler construction, fittings, and operation
2. Combustion, fuels, burners, and draft
3. Steam systems, condensate, and boiler accessories
4. Boiler water chemistry and water treatment
5. Turbines, engines, and power generation
6. Pumps, compressors, motors, and mechanical equipment
7. Electrical systems, generators, switchgear, and power distribution
8. Refrigeration, chillers, HVAC, and cooling systems
9. Instrumentation, controls, automation, and troubleshooting
10. Maryland licensing, safety, maintenance, and operating practices
, Page 2 of 96
QUESTIONS 1–250
Boilers, Combustion, Steam, and Water Treatment
1. Which condition most directly indicates that a boiler is producing steam safely under normal
operating conditions in a high-pressure plant?
A. Stable operating pressure within the prescribed range
B. Maximum possible flame temperature
C. Minimum possible feedwater temperature
D. Complete closure of the main steam valve
Answer: A
2. What is the primary purpose of a boiler safety valve when excessive steam pressure develops
during operation?
A. Increase burner efficiency
B. Automatically relieve pressure before dangerous overpressure occurs
C. Reduce dissolved solids
D. Increase feedwater temperature
Answer: B
, Page 3 of 96
3. Why must a stationary engineer maintain adequate water level inside a steam boiler during
continuous operation?
A. To increase stack temperature
B. To eliminate all dissolved oxygen
C. To prevent heating surfaces from becoming dangerously exposed
D. To reduce steam pressure immediately
Answer: C
4. Which boiler instrument provides the operator with a direct indication of steam pressure inside the
pressure vessel?
A. Thermocouple
B. Psychrometer
C. Flowmeter
D. Pressure gauge
Answer: D
5. What is the principal purpose of a low-water cutoff installed on a steam boiler during normal plant
operation?
A. Stop firing when the water level becomes dangerously low
B. Increase the boiler water temperature
, Page 4 of 96
C. Increase combustion-air pressure
D. Open the main steam stop valve
Answer: A
6. Which boiler component transfers heat from combustion gases into water to generate steam during
normal operation?
A. Economizer
B. Furnace heating surfaces
C. Blowdown valve
D. Steam trap
Answer: B
7. Why is boiler blowdown routinely performed in a high-pressure steam plant?
A. To raise dissolved-solids concentration
B. To increase fuel consumption
C. To control accumulated dissolved and suspended impurities
D. To eliminate the need for water treatment
Answer: C
MD STATIONARY ENGINEER — GRADE 1 EXAM
QUESTIONS AND VERIFIED ANSWERS
MD STATIONARY ENGINEER — GRADE 1 EXAM
10 EXAM COVERAGE AREAS
1. Boilers, boiler construction, fittings, and operation
2. Combustion, fuels, burners, and draft
3. Steam systems, condensate, and boiler accessories
4. Boiler water chemistry and water treatment
5. Turbines, engines, and power generation
6. Pumps, compressors, motors, and mechanical equipment
7. Electrical systems, generators, switchgear, and power distribution
8. Refrigeration, chillers, HVAC, and cooling systems
9. Instrumentation, controls, automation, and troubleshooting
10. Maryland licensing, safety, maintenance, and operating practices
, Page 2 of 96
QUESTIONS 1–250
Boilers, Combustion, Steam, and Water Treatment
1. Which condition most directly indicates that a boiler is producing steam safely under normal
operating conditions in a high-pressure plant?
A. Stable operating pressure within the prescribed range
B. Maximum possible flame temperature
C. Minimum possible feedwater temperature
D. Complete closure of the main steam valve
Answer: A
2. What is the primary purpose of a boiler safety valve when excessive steam pressure develops
during operation?
A. Increase burner efficiency
B. Automatically relieve pressure before dangerous overpressure occurs
C. Reduce dissolved solids
D. Increase feedwater temperature
Answer: B
, Page 3 of 96
3. Why must a stationary engineer maintain adequate water level inside a steam boiler during
continuous operation?
A. To increase stack temperature
B. To eliminate all dissolved oxygen
C. To prevent heating surfaces from becoming dangerously exposed
D. To reduce steam pressure immediately
Answer: C
4. Which boiler instrument provides the operator with a direct indication of steam pressure inside the
pressure vessel?
A. Thermocouple
B. Psychrometer
C. Flowmeter
D. Pressure gauge
Answer: D
5. What is the principal purpose of a low-water cutoff installed on a steam boiler during normal plant
operation?
A. Stop firing when the water level becomes dangerously low
B. Increase the boiler water temperature
, Page 4 of 96
C. Increase combustion-air pressure
D. Open the main steam stop valve
Answer: A
6. Which boiler component transfers heat from combustion gases into water to generate steam during
normal operation?
A. Economizer
B. Furnace heating surfaces
C. Blowdown valve
D. Steam trap
Answer: B
7. Why is boiler blowdown routinely performed in a high-pressure steam plant?
A. To raise dissolved-solids concentration
B. To increase fuel consumption
C. To control accumulated dissolved and suspended impurities
D. To eliminate the need for water treatment
Answer: C
