MARYLAND STATIONARY ENGINEER GRADE 3 EXAM /LATEST
MARYLAND STATIONARY ENGINEER GRADE 3 ACTUAL EXAM
2026/2027& PRACTICE QUESTIONS COMPLETE ACCURATE EXAM
APPROVED QUESTIONS WITH WELL ELABORATED ANSWERS WITH
RATIONALES (100% CORRECT VERIFIED SOLUTIONS) LATEST
UPDATED VERSION 2026 EDITION |GUARANTEED SUCCESS A+ |JUST
RELEASED
1. A boiler with a MAWP of 150 psig must have its safety valve set at a pressure
not exceeding:
A) 130 psig
B) 140 psig
C) 150 psig – CORRECT ANSWER – Safety valve set pressure must not exceed
MAWP; typically set at MAWP or lower per ASME Code.
D) 165 psig
2. The maximum allowable working pressure (MAWP) for a high-pressure boiler
in Maryland is:
A) 15 psig
B) 30 psig
C) Over 15 psig, unlimited by code but limited by design – CORRECT ANSWER
– Grade 3 engineers may operate boilers over 100 hp and any pressure; high-
pressure defined as over 15 psig steam.
D) 100 psig maximum
3. A boiler’s steam drum internal feedwater pipe must be designed to:
A) Increase steam pressure
B) Distribute feedwater evenly to prevent thermal shock – CORRECT ANSWER –
Reduces localized cooling and minimizes thermal stress on drum shell.
,C) Remove sludge
D) Add chemicals
4. The purpose of a continuous blowdown system is to:
A) Remove bottom sludge only
B) Remove dissolved solids from the surface water continuously – CORRECT
ANSWER – Maintains consistent TDS levels and improves steam purity.
C) Test safety valves
D) Lower steam pressure
5. When two or more boilers are connected to a common header, each boiler’s stop
valve must be:
A) A gate valve only
B) Equipped with a non-return valve or an automatic stop valve – CORRECT
ANSWER – Prevents backflow from header to offline boiler.
C) Removed
D) Left open at all times
6. A Grade 3 stationary engineer in Maryland may supervise:
A) Only Grade 4 engineers
B) Other engineers and operate boilers of any size – CORRECT ANSWER –
Grade 3 is a supervisory grade for high-pressure boilers without restriction.
C) Only electric boilers
D) No other personnel
7. A boiler equipped with a superheater must have a safety valve located:
A) Only on the steam drum
, B) On the superheater outlet header – CORRECT ANSWER – Protects superheater
tubes from overpressure and ensures steam flow during relief.
C) On the feedwater line
D) On the blowdown line
8. The minimum required capacity of safety valves on a high-pressure steam boiler
is:
A) 50% of boiler output
B) 100% of boiler’s maximum steaming capacity – CORRECT ANSWER – Must
relieve all steam generated without pressure rise exceeding 6% for power boilers.
C) 150% of boiler output
D) Determined by owner
9. A hydrostatic test of a boiler after major repair must be performed at:
A) MAWP
B) 1.5 × MAWP or as specified by inspector – CORRECT ANSWER – ASME
Code requires 1.5 times MAWP to verify repair integrity.
C) 2 × MAWP
D) 0.5 × MAWP
10. The purpose of a desuperheater in a steam system is to:
A) Increase pressure
B) Reduce steam temperature by adding water – CORRECT ANSWER – Used to
condition superheated steam for process or heating applications.
C) Remove condensate
D) Increase superheat
MARYLAND STATIONARY ENGINEER GRADE 3 ACTUAL EXAM
2026/2027& PRACTICE QUESTIONS COMPLETE ACCURATE EXAM
APPROVED QUESTIONS WITH WELL ELABORATED ANSWERS WITH
RATIONALES (100% CORRECT VERIFIED SOLUTIONS) LATEST
UPDATED VERSION 2026 EDITION |GUARANTEED SUCCESS A+ |JUST
RELEASED
1. A boiler with a MAWP of 150 psig must have its safety valve set at a pressure
not exceeding:
A) 130 psig
B) 140 psig
C) 150 psig – CORRECT ANSWER – Safety valve set pressure must not exceed
MAWP; typically set at MAWP or lower per ASME Code.
D) 165 psig
2. The maximum allowable working pressure (MAWP) for a high-pressure boiler
in Maryland is:
A) 15 psig
B) 30 psig
C) Over 15 psig, unlimited by code but limited by design – CORRECT ANSWER
– Grade 3 engineers may operate boilers over 100 hp and any pressure; high-
pressure defined as over 15 psig steam.
D) 100 psig maximum
3. A boiler’s steam drum internal feedwater pipe must be designed to:
A) Increase steam pressure
B) Distribute feedwater evenly to prevent thermal shock – CORRECT ANSWER –
Reduces localized cooling and minimizes thermal stress on drum shell.
,C) Remove sludge
D) Add chemicals
4. The purpose of a continuous blowdown system is to:
A) Remove bottom sludge only
B) Remove dissolved solids from the surface water continuously – CORRECT
ANSWER – Maintains consistent TDS levels and improves steam purity.
C) Test safety valves
D) Lower steam pressure
5. When two or more boilers are connected to a common header, each boiler’s stop
valve must be:
A) A gate valve only
B) Equipped with a non-return valve or an automatic stop valve – CORRECT
ANSWER – Prevents backflow from header to offline boiler.
C) Removed
D) Left open at all times
6. A Grade 3 stationary engineer in Maryland may supervise:
A) Only Grade 4 engineers
B) Other engineers and operate boilers of any size – CORRECT ANSWER –
Grade 3 is a supervisory grade for high-pressure boilers without restriction.
C) Only electric boilers
D) No other personnel
7. A boiler equipped with a superheater must have a safety valve located:
A) Only on the steam drum
, B) On the superheater outlet header – CORRECT ANSWER – Protects superheater
tubes from overpressure and ensures steam flow during relief.
C) On the feedwater line
D) On the blowdown line
8. The minimum required capacity of safety valves on a high-pressure steam boiler
is:
A) 50% of boiler output
B) 100% of boiler’s maximum steaming capacity – CORRECT ANSWER – Must
relieve all steam generated without pressure rise exceeding 6% for power boilers.
C) 150% of boiler output
D) Determined by owner
9. A hydrostatic test of a boiler after major repair must be performed at:
A) MAWP
B) 1.5 × MAWP or as specified by inspector – CORRECT ANSWER – ASME
Code requires 1.5 times MAWP to verify repair integrity.
C) 2 × MAWP
D) 0.5 × MAWP
10. The purpose of a desuperheater in a steam system is to:
A) Increase pressure
B) Reduce steam temperature by adding water – CORRECT ANSWER – Used to
condition superheated steam for process or heating applications.
C) Remove condensate
D) Increase superheat
