OHIO BOILER OPERATOR EXAM PRATICE
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2025|2026 Q&A | INSTANT DOWNLOAD PDF
1.
What is the primary function of a boiler?
A. To cool water
B. To produce steam
C. To condense steam
D. To circulate air
The boiler’s main purpose is to convert water into steam by applying heat.
2.
What is the main component that contains the water and steam in a boiler?
A. Superheater
B. Economizer
C. Boiler shell
D. Steam drum
The boiler shell houses the water and steam under pressure.
3.
What is the primary purpose of a safety valve?
A. Control water level
B. Prevent overpressure
C. Measure temperature
D. Lubricate valves
Safety valves automatically release pressure if it exceeds safe limits.
4.
,What is the function of the boiler feedwater pump?
A. Drain condensate
B. Remove scale
C. Supply water to the boiler
D. Cool the system
The feedwater pump pushes water into the boiler against pressure.
5.
What is “steam pressure” measured in?
A. Joules
B. Degrees Fahrenheit
C. Pounds per square inch (PSI)
D. BTUs
Boiler pressure is typically measured in PSI.
6.
What device controls the firing rate of a boiler?
A. Safety valve
B. Pressure control
C. Gauge glass
D. Fusible plug
Pressure controls adjust burner operation to maintain desired pressure.
7.
What is the function of a fusible plug?
A. To release steam
B. To indicate water level
C. To prevent overheating by melting if water is too low
D. To clean tubes
The fusible plug melts when the water level drops dangerously low.
8.
Which of the following is a fire-tube boiler?
A. Scotch marine
B. Lamont
C. Benson
D. Loeffler
Fire-tube boilers have hot gases inside tubes surrounded by water.
, 9.
Which of the following is a water-tube boiler?
A. Scotch marine
B. Babcock and Wilcox
C. Cochran
D. Cornish
In water-tube boilers, water flows inside tubes heated externally by fire.
10.
What is the function of a superheater?
A. Preheat feedwater
B. Increase the temperature of steam above saturation point
C. Remove air
D. Reduce steam pressure
Superheaters raise the temperature of steam to improve efficiency.
11.
What is the purpose of the blowdown valve?
A. Release steam
B. Remove sludge and sediment from the boiler
C. Reduce fuel usage
D. Increase water flow
Blowdown removes impurities and maintains boiler water quality.
12.
What is the normal color of a good gas flame in a boiler burner?
A. Yellow
B. Blue
C. Red
D. White
A blue flame indicates complete combustion and good efficiency.
13.
Which instrument shows the amount of water in the boiler?
A. Pressure gauge
B. Gauge glass
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2025|2026 Q&A | INSTANT DOWNLOAD PDF
1.
What is the primary function of a boiler?
A. To cool water
B. To produce steam
C. To condense steam
D. To circulate air
The boiler’s main purpose is to convert water into steam by applying heat.
2.
What is the main component that contains the water and steam in a boiler?
A. Superheater
B. Economizer
C. Boiler shell
D. Steam drum
The boiler shell houses the water and steam under pressure.
3.
What is the primary purpose of a safety valve?
A. Control water level
B. Prevent overpressure
C. Measure temperature
D. Lubricate valves
Safety valves automatically release pressure if it exceeds safe limits.
4.
,What is the function of the boiler feedwater pump?
A. Drain condensate
B. Remove scale
C. Supply water to the boiler
D. Cool the system
The feedwater pump pushes water into the boiler against pressure.
5.
What is “steam pressure” measured in?
A. Joules
B. Degrees Fahrenheit
C. Pounds per square inch (PSI)
D. BTUs
Boiler pressure is typically measured in PSI.
6.
What device controls the firing rate of a boiler?
A. Safety valve
B. Pressure control
C. Gauge glass
D. Fusible plug
Pressure controls adjust burner operation to maintain desired pressure.
7.
What is the function of a fusible plug?
A. To release steam
B. To indicate water level
C. To prevent overheating by melting if water is too low
D. To clean tubes
The fusible plug melts when the water level drops dangerously low.
8.
Which of the following is a fire-tube boiler?
A. Scotch marine
B. Lamont
C. Benson
D. Loeffler
Fire-tube boilers have hot gases inside tubes surrounded by water.
, 9.
Which of the following is a water-tube boiler?
A. Scotch marine
B. Babcock and Wilcox
C. Cochran
D. Cornish
In water-tube boilers, water flows inside tubes heated externally by fire.
10.
What is the function of a superheater?
A. Preheat feedwater
B. Increase the temperature of steam above saturation point
C. Remove air
D. Reduce steam pressure
Superheaters raise the temperature of steam to improve efficiency.
11.
What is the purpose of the blowdown valve?
A. Release steam
B. Remove sludge and sediment from the boiler
C. Reduce fuel usage
D. Increase water flow
Blowdown removes impurities and maintains boiler water quality.
12.
What is the normal color of a good gas flame in a boiler burner?
A. Yellow
B. Blue
C. Red
D. White
A blue flame indicates complete combustion and good efficiency.
13.
Which instrument shows the amount of water in the boiler?
A. Pressure gauge
B. Gauge glass
