Page 1 of 123
Maryland Stationary Engineer – Grade 1 Exam COMPLETE
QUESTIONS AND DETAILED SOLUTIONS LATEST UPDATE THIS
YEAR-JUST RELEASED
Maryland Stationary Engineer – Grade 1 Exam, covering high-pressure boiler operations, ASME codes,
Maryland state regulations, steam systems, water treatment, combustion, and safety devices. All
questions are presented without topical headers, with answers randomly distributed and rationales in
italics.
1. A high-pressure water-tube boiler is operating at 225 psi. The operator notices fluctuating water
levels in the sight glass with intermittent surging. Steam demand has recently increased. What is the
most likely cause?
A) Low fuel supply
B) High dissolved solids causing foaming
C) Faulty pressure gauge
D) Excess air in combustion
Answer: B
Rationale: High dissolved solids cause foaming and priming, leading to unstable water levels, especially
during increased steam demand.
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2. A boiler feedwater pump loses capacity with normal suction pressure but dropping discharge
pressure. What is the most likely cause?
A) Air leak in suction line
B) Worn pump impeller
C) Excess boiler pressure
D) Closed discharge valve
Answer: B
Rationale: A worn impeller reduces the pump’s ability to maintain discharge pressure, decreasing flow
despite normal suction conditions.
3. During operation, the flame appears yellow with visible smoke. Combustion efficiency is reduced.
What is the most likely cause?
A) Excess air
B) Insufficient fuel
C) Inadequate air supply
D) High steam pressure
Answer: C
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Rationale: A yellow, smoky flame indicates incomplete combustion, typically from insufficient air, causing
soot formation and energy loss.
4. A steam trap on a main steam line continuously discharges steam instead of intermittently releasing
condensate. What is the most likely issue?
A) Trap is functioning normally
B) Trap is plugged
C) Trap has failed open
D) Trap has failed closed
Answer: C
Rationale: A trap continuously releasing steam has failed in the open position, causing steam loss and
reduced system efficiency.
5. While starting a boiler, the operator increases firing rate too quickly before reaching operating
temperature. What is the primary risk?
A) Increased efficiency
B) Thermal stress and metal damage
C) Lower water consumption
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D) Higher steam pressure
Answer: B
Rationale: Rapid firing during cold start causes uneven expansion, thermal stress, and potential cracking
of boiler metal.
6. A boiler operates with a water level that is difficult to maintain, surging excessively. What is the most
likely cause?
A) Low steam pressure
B) High total dissolved solids (TDS)
C) Clean gauge glass
D) Proper chemical treatment
Answer: B
Rationale: High TDS causes foaming, creating unstable water levels and surging.
7. What is a Grade 1 Maryland license allowed to operate?
A) Boilers up to 100 HP
B) Boilers up to 500 HP
C) Boilers up to 1,000 HP
Maryland Stationary Engineer – Grade 1 Exam COMPLETE
QUESTIONS AND DETAILED SOLUTIONS LATEST UPDATE THIS
YEAR-JUST RELEASED
Maryland Stationary Engineer – Grade 1 Exam, covering high-pressure boiler operations, ASME codes,
Maryland state regulations, steam systems, water treatment, combustion, and safety devices. All
questions are presented without topical headers, with answers randomly distributed and rationales in
italics.
1. A high-pressure water-tube boiler is operating at 225 psi. The operator notices fluctuating water
levels in the sight glass with intermittent surging. Steam demand has recently increased. What is the
most likely cause?
A) Low fuel supply
B) High dissolved solids causing foaming
C) Faulty pressure gauge
D) Excess air in combustion
Answer: B
Rationale: High dissolved solids cause foaming and priming, leading to unstable water levels, especially
during increased steam demand.
, Page 2 of 123
2. A boiler feedwater pump loses capacity with normal suction pressure but dropping discharge
pressure. What is the most likely cause?
A) Air leak in suction line
B) Worn pump impeller
C) Excess boiler pressure
D) Closed discharge valve
Answer: B
Rationale: A worn impeller reduces the pump’s ability to maintain discharge pressure, decreasing flow
despite normal suction conditions.
3. During operation, the flame appears yellow with visible smoke. Combustion efficiency is reduced.
What is the most likely cause?
A) Excess air
B) Insufficient fuel
C) Inadequate air supply
D) High steam pressure
Answer: C
, Page 3 of 123
Rationale: A yellow, smoky flame indicates incomplete combustion, typically from insufficient air, causing
soot formation and energy loss.
4. A steam trap on a main steam line continuously discharges steam instead of intermittently releasing
condensate. What is the most likely issue?
A) Trap is functioning normally
B) Trap is plugged
C) Trap has failed open
D) Trap has failed closed
Answer: C
Rationale: A trap continuously releasing steam has failed in the open position, causing steam loss and
reduced system efficiency.
5. While starting a boiler, the operator increases firing rate too quickly before reaching operating
temperature. What is the primary risk?
A) Increased efficiency
B) Thermal stress and metal damage
C) Lower water consumption
, Page 4 of 123
D) Higher steam pressure
Answer: B
Rationale: Rapid firing during cold start causes uneven expansion, thermal stress, and potential cracking
of boiler metal.
6. A boiler operates with a water level that is difficult to maintain, surging excessively. What is the most
likely cause?
A) Low steam pressure
B) High total dissolved solids (TDS)
C) Clean gauge glass
D) Proper chemical treatment
Answer: B
Rationale: High TDS causes foaming, creating unstable water levels and surging.
7. What is a Grade 1 Maryland license allowed to operate?
A) Boilers up to 100 HP
B) Boilers up to 500 HP
C) Boilers up to 1,000 HP
