3RD CLASS STATIONARY STEAM ENGINEER
FINAL EXAM SCRIPT 2026
COMPREHENSIVE QUESTIONS AND
ANSWERS VERIFIED A+
●● A three phase squirrel cage induction motor could run hot due to all
except?
A) A grounded station
B) A shortened station
C) A high power factor. Answer: High power factor
●● The switch in the windowbox that verifies combustion air when
entering the furance is the?
A) Combustion Air damper switch
B) High Limit Switch
C)Air flow proving switch. Answer: Combustion Air damper switch
●● Whats does a flame safegaurd system prevent?
A) Tube Failures
B) Combustion Explosions
C) Boiler control failures. Answer: Combustion explosions
,●● What is the functin of the saftey valve blowback ring?
A) Prevent saftey valve from leaking
B) Prevent Simmering
C) Increase or decrease amount of blowdown. Answer: Increase or
decrease amount of blowdown
●● What would cause a tube in a scotch marine boiler to burst?
A) Low water condition
B) Corrosion of the tube
C) Tubes are under external pressure, may collape but not burst. Answer:
Tubes are under external pressure, may collape but not burst
●● What is priming?
A) Generating steam bubbles in steam space
B) Carryover of the tube
C) Carryover of water. Answer: Carryover of water
●● What condition is more injurious to a boiler?
A) Overpreesure
B) Overheat
C) Both. Answer: Both?
, ●● In a single boiler plant, what pressure should the non-return valve be
opened
A) 25 psi
B) 50 psi
C) Prior to lighting off. Answer: Prior to light off?
●● Sporadic Excessive vibration in steam turbine likely caused by
A) Boiler carryover
B) Turbine shaft misalignment
C) Worn thrust bearing. Answer: Boiler carryover
●● Primary advantages of using fluidized bed boilers
A) Use of low heat value fuel
B) Air emissions
C) Both A + B. Answer: Both A+ B
●● Why does scale reduce efficiency of boiler?
A) Scale provides insulation barrier to flow of heat. Answer: Scale
provides insulation barrier to flow of heat
●● What causes heavy black smokewhen fuel oil is burned?
A) Insufficient air
B) Insufficient fuel
FINAL EXAM SCRIPT 2026
COMPREHENSIVE QUESTIONS AND
ANSWERS VERIFIED A+
●● A three phase squirrel cage induction motor could run hot due to all
except?
A) A grounded station
B) A shortened station
C) A high power factor. Answer: High power factor
●● The switch in the windowbox that verifies combustion air when
entering the furance is the?
A) Combustion Air damper switch
B) High Limit Switch
C)Air flow proving switch. Answer: Combustion Air damper switch
●● Whats does a flame safegaurd system prevent?
A) Tube Failures
B) Combustion Explosions
C) Boiler control failures. Answer: Combustion explosions
,●● What is the functin of the saftey valve blowback ring?
A) Prevent saftey valve from leaking
B) Prevent Simmering
C) Increase or decrease amount of blowdown. Answer: Increase or
decrease amount of blowdown
●● What would cause a tube in a scotch marine boiler to burst?
A) Low water condition
B) Corrosion of the tube
C) Tubes are under external pressure, may collape but not burst. Answer:
Tubes are under external pressure, may collape but not burst
●● What is priming?
A) Generating steam bubbles in steam space
B) Carryover of the tube
C) Carryover of water. Answer: Carryover of water
●● What condition is more injurious to a boiler?
A) Overpreesure
B) Overheat
C) Both. Answer: Both?
, ●● In a single boiler plant, what pressure should the non-return valve be
opened
A) 25 psi
B) 50 psi
C) Prior to lighting off. Answer: Prior to light off?
●● Sporadic Excessive vibration in steam turbine likely caused by
A) Boiler carryover
B) Turbine shaft misalignment
C) Worn thrust bearing. Answer: Boiler carryover
●● Primary advantages of using fluidized bed boilers
A) Use of low heat value fuel
B) Air emissions
C) Both A + B. Answer: Both A+ B
●● Why does scale reduce efficiency of boiler?
A) Scale provides insulation barrier to flow of heat. Answer: Scale
provides insulation barrier to flow of heat
●● What causes heavy black smokewhen fuel oil is burned?
A) Insufficient air
B) Insufficient fuel
