AK Boiler Operator Certificate Exam
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the primary purpose of a boiler?
A. To store steam
B. To cool water
C. To generate steam by applying heat
D. To circulate air
The boiler’s main function is to convert water to steam for heating or
power applications.
2. The section of a boiler where heat is transferred to water is called the:
A. Economizer
B. Heat exchanger
C. Combustion chamber
D. Header
The heat exchanger is where heat transfer takes place from combustion
gases to boiler water.
3. The safety valve on a boiler is designed to:
A. Regulate feedwater flow
B. Release air from the system
C. Prevent excessive pressure buildup
D. Maintain water level
Safety valves automatically relieve pressure to keep the boiler from
exceeding safe limits.
,4. Low-water cutoff devices are required to:
A. Reduce pressure
B. Increase temperature
C. Stop the burner when water is dangerously low
D. Vent steam
Low‐water conditions can damage tubes; the device prevents dry firing.
5. The ASME code governs:
A. Combustion testing
B. Steam trap maintenance
C. Construction and operation of boilers
D. Water chemistry only
ASME establishes boiler design, fabrication, and safety requirements.
6. A boiler blowdown removes:
A. Oil
B. Air
C. Sediment and dissolved solids
D. Fuel residues
Blowdown controls total dissolved solids and prevents scale and sludge.
7. A steam pressure gauge must be located:
A. On the feedwater pump
B. At the economizer
C. On the boiler steam drum or header
D. At ground level
The gauge must show actual boiler pressure at the steam space.
8. A boiler hydrostatic test is conducted to check for:
A. Fuel efficiency
B. Leaks and integrity
C. Water quality
D. Combustion problems
, Hydrostatic pressure tests confirm the pressure-holding capability of the
boiler shell and tubes.
9. Scale in a boiler is caused primarily by:
A. Low fuel pressure
B. Poor combustion
C. Hard water minerals precipitating
D. Excess blowdown
Calcium and magnesium create deposits that insulate tubes.
10. The main purpose of a deaerator is to remove:
A. Sediment
B. Oxygen and gases
C. Hardness
D. Oil
Removing oxygen prevents corrosion of boiler metal surfaces.
11. Foaming in a boiler is caused by:
A. High fuel pressure
B. Clean water
C. High dissolved solids
D. Low steam demand
Excess solids cause stable bubbles that lead to carryover.
12. A flame scanner ensures that:
A. Water is circulating
B. Pressure stays constant
C. A flame is present during operation
D. Fuel temperature is correct
It detects flame presence to prevent fuel accumulation.
13. The main source of boiler corrosion is:
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the primary purpose of a boiler?
A. To store steam
B. To cool water
C. To generate steam by applying heat
D. To circulate air
The boiler’s main function is to convert water to steam for heating or
power applications.
2. The section of a boiler where heat is transferred to water is called the:
A. Economizer
B. Heat exchanger
C. Combustion chamber
D. Header
The heat exchanger is where heat transfer takes place from combustion
gases to boiler water.
3. The safety valve on a boiler is designed to:
A. Regulate feedwater flow
B. Release air from the system
C. Prevent excessive pressure buildup
D. Maintain water level
Safety valves automatically relieve pressure to keep the boiler from
exceeding safe limits.
,4. Low-water cutoff devices are required to:
A. Reduce pressure
B. Increase temperature
C. Stop the burner when water is dangerously low
D. Vent steam
Low‐water conditions can damage tubes; the device prevents dry firing.
5. The ASME code governs:
A. Combustion testing
B. Steam trap maintenance
C. Construction and operation of boilers
D. Water chemistry only
ASME establishes boiler design, fabrication, and safety requirements.
6. A boiler blowdown removes:
A. Oil
B. Air
C. Sediment and dissolved solids
D. Fuel residues
Blowdown controls total dissolved solids and prevents scale and sludge.
7. A steam pressure gauge must be located:
A. On the feedwater pump
B. At the economizer
C. On the boiler steam drum or header
D. At ground level
The gauge must show actual boiler pressure at the steam space.
8. A boiler hydrostatic test is conducted to check for:
A. Fuel efficiency
B. Leaks and integrity
C. Water quality
D. Combustion problems
, Hydrostatic pressure tests confirm the pressure-holding capability of the
boiler shell and tubes.
9. Scale in a boiler is caused primarily by:
A. Low fuel pressure
B. Poor combustion
C. Hard water minerals precipitating
D. Excess blowdown
Calcium and magnesium create deposits that insulate tubes.
10. The main purpose of a deaerator is to remove:
A. Sediment
B. Oxygen and gases
C. Hardness
D. Oil
Removing oxygen prevents corrosion of boiler metal surfaces.
11. Foaming in a boiler is caused by:
A. High fuel pressure
B. Clean water
C. High dissolved solids
D. Low steam demand
Excess solids cause stable bubbles that lead to carryover.
12. A flame scanner ensures that:
A. Water is circulating
B. Pressure stays constant
C. A flame is present during operation
D. Fuel temperature is correct
It detects flame presence to prevent fuel accumulation.
13. The main source of boiler corrosion is:
