Page 1 of 132
Maryland Grade 1 Stationary Engineer Exam
ACTUAL QUESTIONS AND ANSWERS LATEST
UPDATE THIS YEAR
Maryland Grade 1 Stationary Engineer Exam, covering high-pressure boiler operations, ASME codes,
Maryland state regulations, steam systems, water treatment, combustion theory, and safety devices.
1. A high-pressure water-tube boiler is operating at 225 psi. During inspection, 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 can cause foaming and priming, leading to unstable water levels in the
sight glass, especially during increased steam demand .
, Page 2 of 132
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, leading to
decreased 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 132
Rationale: A yellow, smoky flame indicates incomplete combustion, usually due to insufficient air,
resulting in soot formation and energy loss .
4. An operator observes that a steam trap on a main steam line is continuously discharging 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 that continuously releases steam has failed in the open position, causing steam loss
and reduced system efficiency .
5. While starting a boiler, the operator increases the firing rate too quickly before reaching operating
temperature. What is the primary risk?
A) Increased efficiency
B) Thermal stress and metal damage
, Page 4 of 132
C) Lower water consumption
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 system experiences loud banging noises in the piping during startup. Most likely cause?
A) High pressure steam
B) Water hammer from condensate accumulation
C) Low fuel supply
D) Excess air in combustion
Answer: B
Rationale: Water hammer occurs when condensate accumulates and is suddenly pushed by steam,
causing shock waves and pipe banging .
7. Increased stack temperature with higher fuel consumption but constant steam output indicates:
A) Improved efficiency
Maryland Grade 1 Stationary Engineer Exam
ACTUAL QUESTIONS AND ANSWERS LATEST
UPDATE THIS YEAR
Maryland Grade 1 Stationary Engineer Exam, covering high-pressure boiler operations, ASME codes,
Maryland state regulations, steam systems, water treatment, combustion theory, and safety devices.
1. A high-pressure water-tube boiler is operating at 225 psi. During inspection, 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 can cause foaming and priming, leading to unstable water levels in the
sight glass, especially during increased steam demand .
, Page 2 of 132
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, leading to
decreased 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 132
Rationale: A yellow, smoky flame indicates incomplete combustion, usually due to insufficient air,
resulting in soot formation and energy loss .
4. An operator observes that a steam trap on a main steam line is continuously discharging 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 that continuously releases steam has failed in the open position, causing steam loss
and reduced system efficiency .
5. While starting a boiler, the operator increases the firing rate too quickly before reaching operating
temperature. What is the primary risk?
A) Increased efficiency
B) Thermal stress and metal damage
, Page 4 of 132
C) Lower water consumption
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 system experiences loud banging noises in the piping during startup. Most likely cause?
A) High pressure steam
B) Water hammer from condensate accumulation
C) Low fuel supply
D) Excess air in combustion
Answer: B
Rationale: Water hammer occurs when condensate accumulates and is suddenly pushed by steam,
causing shock waves and pipe banging .
7. Increased stack temperature with higher fuel consumption but constant steam output indicates:
A) Improved efficiency
