MARYLAND STATIONARY ENGINEER GRADE 4 EXAM /LATEST
MARYLAND STATIONARY ENGINEER GRADE 4 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’s safety valve must be capable of relieving all steam generated without
the pressure rising more than _____ above the maximum allowable working
pressure (MAWP).
A) 3%
B) 6%
C) 10% – CORRECT ANSWER – ASME Boiler Code requires safety valves to
prevent pressure from exceeding MAWP by more than 10% for power boilers.
D) 15%
2. The lowest permissible water level for a fire tube boiler operation is determined
by:
A) The lowest visible point in the gauge glass
B) The highest point of the heating surface – CORRECT ANSWER – Water level
must cover all heating surfaces to prevent overheating and damage.
C) Mid-gauge glass
D) Top of the steam drum
3. What is the primary function of a steam trap?
A) Trap steam for efficiency
,B) Remove condensate and air without passing steam – CORRECT ANSWER –
Steam traps discharge condensate while preventing live steam loss.
C) Regulate steam pressure
D) Reduce boiler pressure
4. A gauge glass on a boiler should be blown down:
A) Once per month
B) Each shift and after adding water – CORRECT ANSWER – Frequent
blowdown ensures the water column and gauge glass are clear of sediment and
accurate.
C) Only during annual inspection
D) Never on high-pressure boilers
5. The maximum allowable working pressure (MAWP) for a low-pressure heating
boiler is:
A) 15 psig steam / 30 psig water – CORRECT ANSWER – Maryland codes define
low-pressure steam boilers as max 15 psig, hot water boilers 30 psig or 250°F.
B) 30 psig steam / 60 psig water
C) 100 psig steam
D) 150 psig steam
6. Which device automatically shuts off the fuel supply when the boiler water level
drops below the safe minimum?
A) Safety valve
B) Low water cutoff – CORRECT ANSWER – Prevents boiler damage from low
water conditions by cutting fuel and firing.
C) High limit control
D) Operating control
, 7. The purpose of boiler blowdown is to:
A) Lower steam pressure
B) Remove concentrated solids and sludge – CORRECT ANSWER – Prevents
scale buildup and carryover by controlling total dissolved solids (TDS).
C) Increase efficiency by 50%
D) Test safety valves
8. A compound gauge on a boiler measures:
A) Temperature and pressure
B) Pressure below and above atmospheric pressure – CORRECT ANSWER –
Typically used on the suction side of pumps or condensate receivers.
C) Only vacuum
D) Only positive pressure
9. When lighting off a boiler, the purging cycle ensures:
A) The fuel pump is primed
B) Removal of unburned combustible gases – CORRECT ANSWER – Prevents
explosions by clearing the furnace of any accumulated flammable vapors.
C) The water level is correct
D) Safety valve is operational
10. A fire tube boiler’s maximum allowable working pressure is limited primarily
by:
A) The size of the burner
B) The thickness and strength of the shell – CORRECT ANSWER – Shell must
withstand internal pressure; tubes experience less stress.
MARYLAND STATIONARY ENGINEER GRADE 4 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’s safety valve must be capable of relieving all steam generated without
the pressure rising more than _____ above the maximum allowable working
pressure (MAWP).
A) 3%
B) 6%
C) 10% – CORRECT ANSWER – ASME Boiler Code requires safety valves to
prevent pressure from exceeding MAWP by more than 10% for power boilers.
D) 15%
2. The lowest permissible water level for a fire tube boiler operation is determined
by:
A) The lowest visible point in the gauge glass
B) The highest point of the heating surface – CORRECT ANSWER – Water level
must cover all heating surfaces to prevent overheating and damage.
C) Mid-gauge glass
D) Top of the steam drum
3. What is the primary function of a steam trap?
A) Trap steam for efficiency
,B) Remove condensate and air without passing steam – CORRECT ANSWER –
Steam traps discharge condensate while preventing live steam loss.
C) Regulate steam pressure
D) Reduce boiler pressure
4. A gauge glass on a boiler should be blown down:
A) Once per month
B) Each shift and after adding water – CORRECT ANSWER – Frequent
blowdown ensures the water column and gauge glass are clear of sediment and
accurate.
C) Only during annual inspection
D) Never on high-pressure boilers
5. The maximum allowable working pressure (MAWP) for a low-pressure heating
boiler is:
A) 15 psig steam / 30 psig water – CORRECT ANSWER – Maryland codes define
low-pressure steam boilers as max 15 psig, hot water boilers 30 psig or 250°F.
B) 30 psig steam / 60 psig water
C) 100 psig steam
D) 150 psig steam
6. Which device automatically shuts off the fuel supply when the boiler water level
drops below the safe minimum?
A) Safety valve
B) Low water cutoff – CORRECT ANSWER – Prevents boiler damage from low
water conditions by cutting fuel and firing.
C) High limit control
D) Operating control
, 7. The purpose of boiler blowdown is to:
A) Lower steam pressure
B) Remove concentrated solids and sludge – CORRECT ANSWER – Prevents
scale buildup and carryover by controlling total dissolved solids (TDS).
C) Increase efficiency by 50%
D) Test safety valves
8. A compound gauge on a boiler measures:
A) Temperature and pressure
B) Pressure below and above atmospheric pressure – CORRECT ANSWER –
Typically used on the suction side of pumps or condensate receivers.
C) Only vacuum
D) Only positive pressure
9. When lighting off a boiler, the purging cycle ensures:
A) The fuel pump is primed
B) Removal of unburned combustible gases – CORRECT ANSWER – Prevents
explosions by clearing the furnace of any accumulated flammable vapors.
C) The water level is correct
D) Safety valve is operational
10. A fire tube boiler’s maximum allowable working pressure is limited primarily
by:
A) The size of the burner
B) The thickness and strength of the shell – CORRECT ANSWER – Shell must
withstand internal pressure; tubes experience less stress.
