Alberta Low Pressure Boiler Operator
Advanced Certification Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. What is the primary purpose of a boiler economizer?
A. To recover heat from flue gases
B. To increase steam pressure
C. To reduce water treatment requirements
D. To regulate boiler feedwater flow
Economizers increase overall boiler efficiency by preheating
feedwater using waste heat from flue gases.
2. Which of the following best describes a safety valve on a boiler?
A. Controls boiler feedwater
B. Relieves excess pressure to prevent explosions
C. Measures boiler water level
D. Regulates fuel flow
Safety valves automatically release steam when pressure exceeds
a set limit, protecting the boiler.
3. The term “blowdown” in boiler operation refers to:
A. Shutting down the boiler
B. Increasing fuel flow
C. Removing dissolved solids from boiler water
D. Venting steam to the atmosphere
, Blowdown prevents scale and corrosion by reducing dissolved and
suspended solids in the boiler.
4. What is the primary reason for using deaerated feedwater?
A. To increase steam production
B. To remove oxygen and other dissolved gases
C. To reduce fuel consumption
D. To improve heat transfer in the economizer
Dissolved oxygen can cause severe corrosion; deaeration removes
it before entering the boiler.
5. A boiler operating at 100 kPa gauge pressure produces how much
saturated steam temperature?
A. 50°C
B. 80°C
C. 120°C
D. 150°C
At 100 kPa (approx. 1 bar gauge), saturated steam temperature is
around 120°C.
6. Which of the following instruments is used to measure boiler
drum water level?
A. Pressure gauge
B. Sight glass
C. Thermocouple
D. Flow meter
The sight glass provides a visual indication of water level inside the
boiler drum.
7. What is the function of a boiler fusible plug?
A. To regulate feedwater flow
, B. To control fuel-air mixture
C. To melt at high temperature and release steam in case of low
water
D. To measure steam pressure
Fusible plugs protect the boiler from overheating when water level
drops, preventing damage.
8. Which of the following is the main purpose of boiler water
treatment?
A. Increase fuel efficiency
B. Reduce steam temperature
C. Prevent scale and corrosion
D. Control boiler pressure
Proper water treatment prevents scale, corrosion, and deposits
that reduce efficiency and safety.
9. In a low pressure boiler, what is the typical operating pressure
range?
A. 0–50 kPa
B. 101–350 kPa
C. 500–1000 kPa
D. Above 1 MPa
Low pressure boilers in Alberta are usually rated between 101–350
kPa.
10. What is “carryover” in boiler operation?
A. Excess fuel in the burner
B. High water level in the drum
C. Water droplets carried with steam into the system
D. Residual heat in boiler tubes
Advanced Certification Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. What is the primary purpose of a boiler economizer?
A. To recover heat from flue gases
B. To increase steam pressure
C. To reduce water treatment requirements
D. To regulate boiler feedwater flow
Economizers increase overall boiler efficiency by preheating
feedwater using waste heat from flue gases.
2. Which of the following best describes a safety valve on a boiler?
A. Controls boiler feedwater
B. Relieves excess pressure to prevent explosions
C. Measures boiler water level
D. Regulates fuel flow
Safety valves automatically release steam when pressure exceeds
a set limit, protecting the boiler.
3. The term “blowdown” in boiler operation refers to:
A. Shutting down the boiler
B. Increasing fuel flow
C. Removing dissolved solids from boiler water
D. Venting steam to the atmosphere
, Blowdown prevents scale and corrosion by reducing dissolved and
suspended solids in the boiler.
4. What is the primary reason for using deaerated feedwater?
A. To increase steam production
B. To remove oxygen and other dissolved gases
C. To reduce fuel consumption
D. To improve heat transfer in the economizer
Dissolved oxygen can cause severe corrosion; deaeration removes
it before entering the boiler.
5. A boiler operating at 100 kPa gauge pressure produces how much
saturated steam temperature?
A. 50°C
B. 80°C
C. 120°C
D. 150°C
At 100 kPa (approx. 1 bar gauge), saturated steam temperature is
around 120°C.
6. Which of the following instruments is used to measure boiler
drum water level?
A. Pressure gauge
B. Sight glass
C. Thermocouple
D. Flow meter
The sight glass provides a visual indication of water level inside the
boiler drum.
7. What is the function of a boiler fusible plug?
A. To regulate feedwater flow
, B. To control fuel-air mixture
C. To melt at high temperature and release steam in case of low
water
D. To measure steam pressure
Fusible plugs protect the boiler from overheating when water level
drops, preventing damage.
8. Which of the following is the main purpose of boiler water
treatment?
A. Increase fuel efficiency
B. Reduce steam temperature
C. Prevent scale and corrosion
D. Control boiler pressure
Proper water treatment prevents scale, corrosion, and deposits
that reduce efficiency and safety.
9. In a low pressure boiler, what is the typical operating pressure
range?
A. 0–50 kPa
B. 101–350 kPa
C. 500–1000 kPa
D. Above 1 MPa
Low pressure boilers in Alberta are usually rated between 101–350
kPa.
10. What is “carryover” in boiler operation?
A. Excess fuel in the burner
B. High water level in the drum
C. Water droplets carried with steam into the system
D. Residual heat in boiler tubes
