MD STATIONARY ENGINEER GRADE 1 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 1 ACTUAL EXAM
1. A stationary engineer is preparing to take a high-pressure boiler
offline for annual inspection. The boiler pressure is 250 psi. What is the
FIRST step in the shutdown procedure?
A. Open the super heater drains
B. Close the main steam stop valve
C. CORRECT ANSWER: Secure the fuel supply to the burner
D. Open the blowdown valves
Rationale: Securing the fuel supply stops combustion and heat input,
which is the first critical step before isolating steam flow or cooling the
boiler.
2. What is the minimum required pressure for a low-pressure boiler, as
defined by the ASME Boiler and Pressure Vessel Code?
A. 0–5 psi
B. 5–10 psi
C. CORRECT ANSWER: 0–15 psi
D. 15–25 psi
Rationale: ASME Section IV defines low-pressure boilers as those
operating at steam pressures not exceeding 15 psi for steam heating
boilers.
,3. During a boiler hydrostatic test, the test pressure should be what
percentage above the maximum allowable working pressure (MAWP)?
A. CORRECT ANSWER: 150%
B. 125%
C. 200%
D. 110%
Rationale: ASME Code Section I requires a hydrostatic test at 1.5 times
MAWP to ensure integrity without overstressing the vessel.
4. What is the primary purpose of a continuous blowdown system?
A. Remove sludge from the mud drum
B. CORRECT ANSWER: Control total dissolved solids (TDS) in the
boiler water
C. Increase steam pressure
D. Preheat feedwater
Rationale: Continuous blowdown removes dissolved solids from the
water surface or near the waterline, maintaining TDS within limits to
prevent carryover.
5. A centrifugal pump operating against a closed discharge valve will
experience which condition?
A. Cavitation
B. Dead head with minimal temperature rise
,C. CORRECT ANSWER: Maximum pressure and rapid temperature
rise
D. Reduced amperage draw
Rationale: At no flow (closed discharge), the impeller churns water,
converting mechanical energy to heat, causing rapid temperature rise
and potentially damaging seals.
6. Which of the following is the most common cause of furnace
explosion in a steam boiler?
A. Low water level
B. CORRECT ANSWER: Improper purging before ignition
C. High steam pressure
D. Scale on tubes
Rationale: Accumulation of unburned fuel vapors in the furnace due to
insufficient purging is the primary ignition hazard.
7. What is the function of a flame scanner in an automatically fired
boiler?
A. Measure flue gas temperature
B. CORRECT ANSWER: Verify presence of flame and interlock fuel
supply
C. Regulate air-to-fuel ratio
D. Detect carbon monoxide
Rationale: Flame scanners (UV or IR) provide a safety interlock; if
flame is not detected within seconds of fuel valve opening, the system
shuts down.
, 8. According to the Maryland Department of Labor, how often must a
Grade 1 Stationary Engineer update or renew their license?
A. Annually
B. CORRECT ANSWER: Every 2 years
C. Every 3 years
D. Every 5 years
Rationale: MD regulations require biennial renewal of stationary
engineer licenses, with continuing education credits as specified by the
Board.
9. What is the typical setting for a safety valve on a high-pressure steam
boiler relative to MAWP?
A. CORRECT ANSWER: At or below MAWP
B. 10% above MAWP
C. 25% above MAWP
D. 50% above MAWP
Rationale: ASME Code requires safety valves to be set at or below
MAWP to prevent exceeding the vessel’s design pressure.
10. Which water treatment chemical prevents calcium scale formation
by precipitation in the boiler drum?
A. Morpholine
B. Hydrazine
C. CORRECT ANSWER: Phosphate
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 1 ACTUAL EXAM
1. A stationary engineer is preparing to take a high-pressure boiler
offline for annual inspection. The boiler pressure is 250 psi. What is the
FIRST step in the shutdown procedure?
A. Open the super heater drains
B. Close the main steam stop valve
C. CORRECT ANSWER: Secure the fuel supply to the burner
D. Open the blowdown valves
Rationale: Securing the fuel supply stops combustion and heat input,
which is the first critical step before isolating steam flow or cooling the
boiler.
2. What is the minimum required pressure for a low-pressure boiler, as
defined by the ASME Boiler and Pressure Vessel Code?
A. 0–5 psi
B. 5–10 psi
C. CORRECT ANSWER: 0–15 psi
D. 15–25 psi
Rationale: ASME Section IV defines low-pressure boilers as those
operating at steam pressures not exceeding 15 psi for steam heating
boilers.
,3. During a boiler hydrostatic test, the test pressure should be what
percentage above the maximum allowable working pressure (MAWP)?
A. CORRECT ANSWER: 150%
B. 125%
C. 200%
D. 110%
Rationale: ASME Code Section I requires a hydrostatic test at 1.5 times
MAWP to ensure integrity without overstressing the vessel.
4. What is the primary purpose of a continuous blowdown system?
A. Remove sludge from the mud drum
B. CORRECT ANSWER: Control total dissolved solids (TDS) in the
boiler water
C. Increase steam pressure
D. Preheat feedwater
Rationale: Continuous blowdown removes dissolved solids from the
water surface or near the waterline, maintaining TDS within limits to
prevent carryover.
5. A centrifugal pump operating against a closed discharge valve will
experience which condition?
A. Cavitation
B. Dead head with minimal temperature rise
,C. CORRECT ANSWER: Maximum pressure and rapid temperature
rise
D. Reduced amperage draw
Rationale: At no flow (closed discharge), the impeller churns water,
converting mechanical energy to heat, causing rapid temperature rise
and potentially damaging seals.
6. Which of the following is the most common cause of furnace
explosion in a steam boiler?
A. Low water level
B. CORRECT ANSWER: Improper purging before ignition
C. High steam pressure
D. Scale on tubes
Rationale: Accumulation of unburned fuel vapors in the furnace due to
insufficient purging is the primary ignition hazard.
7. What is the function of a flame scanner in an automatically fired
boiler?
A. Measure flue gas temperature
B. CORRECT ANSWER: Verify presence of flame and interlock fuel
supply
C. Regulate air-to-fuel ratio
D. Detect carbon monoxide
Rationale: Flame scanners (UV or IR) provide a safety interlock; if
flame is not detected within seconds of fuel valve opening, the system
shuts down.
, 8. According to the Maryland Department of Labor, how often must a
Grade 1 Stationary Engineer update or renew their license?
A. Annually
B. CORRECT ANSWER: Every 2 years
C. Every 3 years
D. Every 5 years
Rationale: MD regulations require biennial renewal of stationary
engineer licenses, with continuing education credits as specified by the
Board.
9. What is the typical setting for a safety valve on a high-pressure steam
boiler relative to MAWP?
A. CORRECT ANSWER: At or below MAWP
B. 10% above MAWP
C. 25% above MAWP
D. 50% above MAWP
Rationale: ASME Code requires safety valves to be set at or below
MAWP to prevent exceeding the vessel’s design pressure.
10. Which water treatment chemical prevents calcium scale formation
by precipitation in the boiler drum?
A. Morpholine
B. Hydrazine
C. CORRECT ANSWER: Phosphate
