MARYLAND GRADE 1 STATIONARY ENGINEER EXAM |
NEWEST 2026 RELEASE | VERIFIED QUESTIONS &
ANSWERS WITH COMPREHENSIVE EXPLANATIONS |
ULTIMATE CERTIFICATION SUCCESS STUDY GUIDE |
PDF AVAILABLE
1. High pressure steam boilers generally operate at pressures:
- A. above 15 psi and over 6 boiler horsepower.
- B. below 15 psi and over 8 boiler horsepower.
- C. above 250 psi and over 6 boiler horsepower.
- D. at 212 psi and over 8 boiler horsepower.
✓ Correct answer: A. above 15 psi and over 6 boiler horsepower.
✓ Rationale: The definition of a high pressure boiler is any boiler operating above 15 psi
with more than 6 boiler horsepower, regardless of the specific pressure value.
2. Pressure gauges should never have a range less than:
- A. half the safety valve set pressure.
- B. double the safety valve set pressure.
- C. 3/4 times the safety valve set pressure.
- D. 1 1/2 times the safety valve set pressure.
✓ Correct answer: D. 1 1/2 times the safety valve set pressure.
✓ Rationale: The gauge range must be 1½ to 2 times the MAWP to prevent damage from
pressure spikes and ensure accurate readings within the operating range.
,3. After water is blown out of a siphon, why should live steam never be allowed to enter a
Bourdon tube?
- A. The steam will rupture the siphon tube.
- B. Combustion gases will mix with the steam.
- C. Live steam will damage the pressure gauge.
- D. The water level gauge will be damaged or destroyed.
✓ Correct answer: C. Live steam will damage the pressure gauge.
✓ Rationale: Live steam carries extremely high temperatures that will overheat and
permanently damage the delicate internal mechanism of the Bourdon tube pressure
gauge.
4. All of the following are essential to maintain the proper fuel oil pressure with fuel oil
accessories EXCEPT:
- A. achieving the right flow of fuel.
- B. proper atomization of the fuel oil.
- C. heating fuel oil to the correct temperature.
- D. obtaining the correct difference in pressure inside and outside the boiler.
✓ Correct answer: D. obtaining the correct difference in pressure inside and outside the
boiler.
✓ Rationale: Pressure difference inside vs outside the boiler relates to draft and combustion,
not to maintaining fuel oil pressure through accessories like pumps, heaters, and strainers.
5. Which of the following could be dangerous to safe operation of a low pressure boiler?
- A. Adding water to an operating boiler when the water level cannot be seen in the gauge glass
tube.
- B. Opening the blowdown valve at the bottom of the water gauge glass before making a water
level reading.
,- C. Checking the water level using the try cocks valves when the line to the glass gauge tube is
clogged.
- D. Opening the water column blowdown valve every day.
✓ Correct answer: A. Adding water to an operating boiler when the water level cannot be
seen in the gauge glass tube.
✓ Rationale: Adding water without knowing the actual level could overfill the boiler or
cause a low-water explosion if the level is actually low and hidden.
6. Which of the following is best if a low-pressure boiler does not have an air vent?
- A. Vent the boiler with the try cocks.
- B. Vent the boiler with the safety valve.
- C. Vent the boiler with the fusible plug.
- D. Vent the boiler with the blowdown line.
✓ Correct answer: A. Vent the boiler with the try cocks.
✓ Rationale: The try cocks provide direct access to the steam space and can be opened to
allow air to escape when no dedicated air vent is installed.
7. What is the purpose of an evaporation test on a low pressure boiler?
- A. To test the water column
- B. To test the bottom blowdown valve
- C. To test the steam pressure safety valve
- D. To test the low water cutoff control.
✓ Correct answer: D. To test the low water cutoff control.
✓ Rationale: The evaporation test allows the water level to drop naturally to verify that the
low water cutoff control functions properly and shuts down the burner at the correct level.
, 8. Following flame failure, controls must de-energize fuel and ignition circuits:
- A. within 4 seconds.
- B. within 6 seconds.
- C. within 10 seconds.
- D. within 15 seconds.
✓ Correct answer: A. within 4 seconds.
✓ Rationale: Safety regulations mandate that fuel and ignition circuits must be de-energized
within 4 seconds of flame failure to prevent dangerous fuel buildup in the furnace.
9. How can an operator prevent damage to the tubes while using a cleaner to remove scale from
boiler tubes?
- A. Never use a chemical cleaning procedure.
- B. Never use cleaning water under pressure.
- C. Never allow the cleaner to stay in one place.
- D. Never clean the tubes more often than every six months.
✓ Correct answer: C. Never allow the cleaner to stay in one place.
✓ Rationale: Allowing the cleaner to remain stationary can erode or overheat a specific spot
on the tube, causing localized damage or tube failure.
10. In a steam boiler, which of the following should never be placed between the safety relief
valve and the boiler?
- A. A steam trap
- B. A shut-off valve
- C. An air eliminator
- D. A discharge pipe
✓ Correct answer: B. A shut-off valve.
NEWEST 2026 RELEASE | VERIFIED QUESTIONS &
ANSWERS WITH COMPREHENSIVE EXPLANATIONS |
ULTIMATE CERTIFICATION SUCCESS STUDY GUIDE |
PDF AVAILABLE
1. High pressure steam boilers generally operate at pressures:
- A. above 15 psi and over 6 boiler horsepower.
- B. below 15 psi and over 8 boiler horsepower.
- C. above 250 psi and over 6 boiler horsepower.
- D. at 212 psi and over 8 boiler horsepower.
✓ Correct answer: A. above 15 psi and over 6 boiler horsepower.
✓ Rationale: The definition of a high pressure boiler is any boiler operating above 15 psi
with more than 6 boiler horsepower, regardless of the specific pressure value.
2. Pressure gauges should never have a range less than:
- A. half the safety valve set pressure.
- B. double the safety valve set pressure.
- C. 3/4 times the safety valve set pressure.
- D. 1 1/2 times the safety valve set pressure.
✓ Correct answer: D. 1 1/2 times the safety valve set pressure.
✓ Rationale: The gauge range must be 1½ to 2 times the MAWP to prevent damage from
pressure spikes and ensure accurate readings within the operating range.
,3. After water is blown out of a siphon, why should live steam never be allowed to enter a
Bourdon tube?
- A. The steam will rupture the siphon tube.
- B. Combustion gases will mix with the steam.
- C. Live steam will damage the pressure gauge.
- D. The water level gauge will be damaged or destroyed.
✓ Correct answer: C. Live steam will damage the pressure gauge.
✓ Rationale: Live steam carries extremely high temperatures that will overheat and
permanently damage the delicate internal mechanism of the Bourdon tube pressure
gauge.
4. All of the following are essential to maintain the proper fuel oil pressure with fuel oil
accessories EXCEPT:
- A. achieving the right flow of fuel.
- B. proper atomization of the fuel oil.
- C. heating fuel oil to the correct temperature.
- D. obtaining the correct difference in pressure inside and outside the boiler.
✓ Correct answer: D. obtaining the correct difference in pressure inside and outside the
boiler.
✓ Rationale: Pressure difference inside vs outside the boiler relates to draft and combustion,
not to maintaining fuel oil pressure through accessories like pumps, heaters, and strainers.
5. Which of the following could be dangerous to safe operation of a low pressure boiler?
- A. Adding water to an operating boiler when the water level cannot be seen in the gauge glass
tube.
- B. Opening the blowdown valve at the bottom of the water gauge glass before making a water
level reading.
,- C. Checking the water level using the try cocks valves when the line to the glass gauge tube is
clogged.
- D. Opening the water column blowdown valve every day.
✓ Correct answer: A. Adding water to an operating boiler when the water level cannot be
seen in the gauge glass tube.
✓ Rationale: Adding water without knowing the actual level could overfill the boiler or
cause a low-water explosion if the level is actually low and hidden.
6. Which of the following is best if a low-pressure boiler does not have an air vent?
- A. Vent the boiler with the try cocks.
- B. Vent the boiler with the safety valve.
- C. Vent the boiler with the fusible plug.
- D. Vent the boiler with the blowdown line.
✓ Correct answer: A. Vent the boiler with the try cocks.
✓ Rationale: The try cocks provide direct access to the steam space and can be opened to
allow air to escape when no dedicated air vent is installed.
7. What is the purpose of an evaporation test on a low pressure boiler?
- A. To test the water column
- B. To test the bottom blowdown valve
- C. To test the steam pressure safety valve
- D. To test the low water cutoff control.
✓ Correct answer: D. To test the low water cutoff control.
✓ Rationale: The evaporation test allows the water level to drop naturally to verify that the
low water cutoff control functions properly and shuts down the burner at the correct level.
, 8. Following flame failure, controls must de-energize fuel and ignition circuits:
- A. within 4 seconds.
- B. within 6 seconds.
- C. within 10 seconds.
- D. within 15 seconds.
✓ Correct answer: A. within 4 seconds.
✓ Rationale: Safety regulations mandate that fuel and ignition circuits must be de-energized
within 4 seconds of flame failure to prevent dangerous fuel buildup in the furnace.
9. How can an operator prevent damage to the tubes while using a cleaner to remove scale from
boiler tubes?
- A. Never use a chemical cleaning procedure.
- B. Never use cleaning water under pressure.
- C. Never allow the cleaner to stay in one place.
- D. Never clean the tubes more often than every six months.
✓ Correct answer: C. Never allow the cleaner to stay in one place.
✓ Rationale: Allowing the cleaner to remain stationary can erode or overheat a specific spot
on the tube, causing localized damage or tube failure.
10. In a steam boiler, which of the following should never be placed between the safety relief
valve and the boiler?
- A. A steam trap
- B. A shut-off valve
- C. An air eliminator
- D. A discharge pipe
✓ Correct answer: B. A shut-off valve.
