MD STATIONARY ENGINEER GRADE 2 EXAM LATEST 2026/2027
ACTUAL TEST APPROVED QUESTIONS WITH WELL ELABORATED
ANSWERS AND DETAILED RATIONALES (100% CORRECT VERIFIED
SOLUTIONS) CURRENTLY UPDATED VERSION 2026 EDITION
|GUARANTEED SUCCESS A+ |FULL REVISED MD STATIONARY
ENGINEER GRADE 2 EXAM |INSTANT DOWNLOAD PDF
1. What is the maximum allowable working pressure (MAWP) for a
low-pressure heating boiler in Maryland?
A. 50 psi
B. 100 psi
C. CORRECT ANSWER: 15 psi for steam, 160 psi for hot water
D. 250 psi
Rationale: ASME Section IV and Maryland codes define low-pressure
steam boilers as ≤15 psi and hot water boilers ≤160 psi or 250°F.
2. A Grade 2 Stationary Engineer in Maryland may operate boilers up to
what maximum horsepower without supervision?
A. 100 HP
B. CORRECT ANSWER: Up to 500 HP (boilers not exceeding 500
horsepower)
C. 750 HP
D. Unlimited with endorsement
Rationale: MD regulations permit Grade 2 engineers to act as shift
engineer in plants with boilers up to 500 HP total capacity.
3. What is the primary purpose of a try lever on a safety valve?
,A. Adjust pressure setting
B. CORRECT ANSWER: Manually open the valve to test operation
C. Lock the valve closed
D. Increase blowdown
Rationale: The try lever allows manual lifting of the disc to verify
freedom of movement and seating.
4. Which of the following is the correct action if the water level in a
steam boiler gauge glass is not visible?
A. Immediately add water
B. CORRECT ANSWER: Perform a gauge glass blowdown to check for
blockage
C. Shut off the burner immediately
D. Increase feed pump pressure
Rationale: The glass may be blocked; blowdown confirms actual water
level. If no water appears, emergency shutdown follows.
5. What is the minimum required blowdown frequency for a low-
pressure steam boiler to prevent sludge buildup?
A. Once per month
B. CORRECT ANSWER: At least once per shift (daily for continuous
operation)
C. Annually only
D. Only when TDS is high
,Rationale: Blowdown removes sediment and controls TDS; daily or per-
shift blowdown is standard practice.
6. A hot water heating system expansion tank that is waterlogged will
cause which symptom?
A. Low system pressure
B. CORRECT ANSWER: Pressure relief valve weeping or frequent
opening
C. Pump cavitation
D. High water temperature
Rationale: Waterlogged tank cannot absorb expansion volume, causing
pressure spikes and relief valve discharge.
7. What is the function of a float and thermostatic steam trap?
A. Trap only air
B. CORRECT ANSWER: Continuously discharge condensate and vent
air
C. Trap steam only
D. Prevent flash steam
Rationale: Float responds to condensate level; thermostatic element
vents air, providing continuous drainage.
8. Which water treatment chemical is used to remove dissolved oxygen
in low-pressure boilers?
A. Phosphate
, B. CORRECT ANSWER: Sodium sulfite
C. Sodium hydroxide
D. Chelating agent
Rationale: Sodium sulfite (Na₂SO₃) reacts with oxygen to form sodium
sulfate, preventing oxygen pitting.
9. During a boiler hydrostatic test, what pressure should be applied to a
low-pressure steam boiler?
A. MAWP
B. CORRECT ANSWER: 1.5 times MAWP or 150%
C. 2 times MAWP
D. 5 psi above MAWP
Rationale: ASME Code requires hydrostatic test at 1.5 × MAWP to
verify integrity without yielding.
10. What is the purpose of a Hartford loop on a steam boiler condensate
return line?
A. Increase steam pressure
B. CORRECT ANSWER: Prevent boiler from draining below safe water
level if return line leaks
C. Reduce water hammer
D. Preheat condensate
Rationale: The loop establishes a minimum safe water level; a broken
return cannot siphon the boiler dry.
ACTUAL TEST APPROVED QUESTIONS WITH WELL ELABORATED
ANSWERS AND DETAILED RATIONALES (100% CORRECT VERIFIED
SOLUTIONS) CURRENTLY UPDATED VERSION 2026 EDITION
|GUARANTEED SUCCESS A+ |FULL REVISED MD STATIONARY
ENGINEER GRADE 2 EXAM |INSTANT DOWNLOAD PDF
1. What is the maximum allowable working pressure (MAWP) for a
low-pressure heating boiler in Maryland?
A. 50 psi
B. 100 psi
C. CORRECT ANSWER: 15 psi for steam, 160 psi for hot water
D. 250 psi
Rationale: ASME Section IV and Maryland codes define low-pressure
steam boilers as ≤15 psi and hot water boilers ≤160 psi or 250°F.
2. A Grade 2 Stationary Engineer in Maryland may operate boilers up to
what maximum horsepower without supervision?
A. 100 HP
B. CORRECT ANSWER: Up to 500 HP (boilers not exceeding 500
horsepower)
C. 750 HP
D. Unlimited with endorsement
Rationale: MD regulations permit Grade 2 engineers to act as shift
engineer in plants with boilers up to 500 HP total capacity.
3. What is the primary purpose of a try lever on a safety valve?
,A. Adjust pressure setting
B. CORRECT ANSWER: Manually open the valve to test operation
C. Lock the valve closed
D. Increase blowdown
Rationale: The try lever allows manual lifting of the disc to verify
freedom of movement and seating.
4. Which of the following is the correct action if the water level in a
steam boiler gauge glass is not visible?
A. Immediately add water
B. CORRECT ANSWER: Perform a gauge glass blowdown to check for
blockage
C. Shut off the burner immediately
D. Increase feed pump pressure
Rationale: The glass may be blocked; blowdown confirms actual water
level. If no water appears, emergency shutdown follows.
5. What is the minimum required blowdown frequency for a low-
pressure steam boiler to prevent sludge buildup?
A. Once per month
B. CORRECT ANSWER: At least once per shift (daily for continuous
operation)
C. Annually only
D. Only when TDS is high
,Rationale: Blowdown removes sediment and controls TDS; daily or per-
shift blowdown is standard practice.
6. A hot water heating system expansion tank that is waterlogged will
cause which symptom?
A. Low system pressure
B. CORRECT ANSWER: Pressure relief valve weeping or frequent
opening
C. Pump cavitation
D. High water temperature
Rationale: Waterlogged tank cannot absorb expansion volume, causing
pressure spikes and relief valve discharge.
7. What is the function of a float and thermostatic steam trap?
A. Trap only air
B. CORRECT ANSWER: Continuously discharge condensate and vent
air
C. Trap steam only
D. Prevent flash steam
Rationale: Float responds to condensate level; thermostatic element
vents air, providing continuous drainage.
8. Which water treatment chemical is used to remove dissolved oxygen
in low-pressure boilers?
A. Phosphate
, B. CORRECT ANSWER: Sodium sulfite
C. Sodium hydroxide
D. Chelating agent
Rationale: Sodium sulfite (Na₂SO₃) reacts with oxygen to form sodium
sulfate, preventing oxygen pitting.
9. During a boiler hydrostatic test, what pressure should be applied to a
low-pressure steam boiler?
A. MAWP
B. CORRECT ANSWER: 1.5 times MAWP or 150%
C. 2 times MAWP
D. 5 psi above MAWP
Rationale: ASME Code requires hydrostatic test at 1.5 × MAWP to
verify integrity without yielding.
10. What is the purpose of a Hartford loop on a steam boiler condensate
return line?
A. Increase steam pressure
B. CORRECT ANSWER: Prevent boiler from draining below safe water
level if return line leaks
C. Reduce water hammer
D. Preheat condensate
Rationale: The loop establishes a minimum safe water level; a broken
return cannot siphon the boiler dry.
