Ontario Oil Burner Technician 1 (OBT1)
Certification Exam With Actual Questions
& Verified Answers, Plus Explained
Rationales/Expert Verified For Guaranteed
100% Pass 2026/Latest Update/Instant
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1. What is the primary purpose of a combustion chamber in an oil
burner system?
A. To store fuel oil
B. To mix air and fuel
C. To allow safe and efficient combustion of fuel
D. To cool exhaust gases
Rationale: The combustion chamber is designed to contain and
sustain the burning process safely while maximizing heat
transfer efficiency.
2. What component is responsible for igniting the oil-air mixture?
A. Fuel pump
B. Ignition transformer
C. Oil filter
D. Draft regulator
Rationale: The ignition transformer generates high voltage to
create a spark that ignites the oil-air mixture.
3. What is the typical function of a cad cell in an oil burner?
A. Regulate fuel pressure
B. Detect flame presence
, C. Filter oil
D. Control airflow
Rationale: A cadmium sulfide (cad cell) sensor detects light from
the flame to confirm combustion.
4. What type of fuel is commonly used in residential oil burners?
A. Gasoline
B. Kerosene only
C. No. 2 fuel oil
D. Diesel fuel only
Rationale: No. 2 fuel oil is the standard fuel used in most
residential heating systems.
5. What is the purpose of the oil filter?
A. Heat the oil
B. Remove contaminants from the oil
C. Increase pressure
D. Atomize oil
Rationale: The oil filter removes dirt and debris to protect system
components and ensure proper combustion.
6. What does atomization refer to in an oil burner?
A. Heating oil
B. Breaking oil into fine droplets
C. Cooling oil
D. Filtering oil
Rationale: Atomization improves combustion by increasing the
surface area of the fuel.
7. Which device controls the oil burner motor operation?
A. Thermostat
B. Limit switch
C. Primary control
, D. Draft regulator
Rationale: The primary control manages burner startup,
operation, and shutdown sequences.
8. What is the function of the thermostat?
A. Increase fuel flow
B. Control temperature by signaling the burner
C. Filter air
D. Ignite fuel
Rationale: The thermostat signals the burner to start or stop
based on temperature settings.
9. What is the purpose of a barometric draft regulator?
A. Increase fuel flow
B. Maintain proper draft in the chimney
C. Filter exhaust gases
D. Ignite fuel
Rationale: It stabilizes chimney draft to ensure consistent
combustion conditions.
10. What happens if there is insufficient air supply?
A. Efficient combustion
B. Incomplete combustion and soot formation
C. Increased efficiency
D. Lower fuel consumption
Rationale: Lack of air leads to incomplete combustion, producing
soot and carbon monoxide.
11. What component pressurizes the oil before it reaches the
nozzle?
A. Thermostat
B. Fuel pump
C. Cad cell
Certification Exam With Actual Questions
& Verified Answers, Plus Explained
Rationales/Expert Verified For Guaranteed
100% Pass 2026/Latest Update/Instant
Download Pdf
1. What is the primary purpose of a combustion chamber in an oil
burner system?
A. To store fuel oil
B. To mix air and fuel
C. To allow safe and efficient combustion of fuel
D. To cool exhaust gases
Rationale: The combustion chamber is designed to contain and
sustain the burning process safely while maximizing heat
transfer efficiency.
2. What component is responsible for igniting the oil-air mixture?
A. Fuel pump
B. Ignition transformer
C. Oil filter
D. Draft regulator
Rationale: The ignition transformer generates high voltage to
create a spark that ignites the oil-air mixture.
3. What is the typical function of a cad cell in an oil burner?
A. Regulate fuel pressure
B. Detect flame presence
, C. Filter oil
D. Control airflow
Rationale: A cadmium sulfide (cad cell) sensor detects light from
the flame to confirm combustion.
4. What type of fuel is commonly used in residential oil burners?
A. Gasoline
B. Kerosene only
C. No. 2 fuel oil
D. Diesel fuel only
Rationale: No. 2 fuel oil is the standard fuel used in most
residential heating systems.
5. What is the purpose of the oil filter?
A. Heat the oil
B. Remove contaminants from the oil
C. Increase pressure
D. Atomize oil
Rationale: The oil filter removes dirt and debris to protect system
components and ensure proper combustion.
6. What does atomization refer to in an oil burner?
A. Heating oil
B. Breaking oil into fine droplets
C. Cooling oil
D. Filtering oil
Rationale: Atomization improves combustion by increasing the
surface area of the fuel.
7. Which device controls the oil burner motor operation?
A. Thermostat
B. Limit switch
C. Primary control
, D. Draft regulator
Rationale: The primary control manages burner startup,
operation, and shutdown sequences.
8. What is the function of the thermostat?
A. Increase fuel flow
B. Control temperature by signaling the burner
C. Filter air
D. Ignite fuel
Rationale: The thermostat signals the burner to start or stop
based on temperature settings.
9. What is the purpose of a barometric draft regulator?
A. Increase fuel flow
B. Maintain proper draft in the chimney
C. Filter exhaust gases
D. Ignite fuel
Rationale: It stabilizes chimney draft to ensure consistent
combustion conditions.
10. What happens if there is insufficient air supply?
A. Efficient combustion
B. Incomplete combustion and soot formation
C. Increased efficiency
D. Lower fuel consumption
Rationale: Lack of air leads to incomplete combustion, producing
soot and carbon monoxide.
11. What component pressurizes the oil before it reaches the
nozzle?
A. Thermostat
B. Fuel pump
C. Cad cell
