ONTARIO OIL BURNER TECHNICIAN 2 (OBT2) CERTIFICATION EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT
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Core Domains
*- Fuel Oil Properties and Classification*
*- Combustion Theory and Analysis*
*- Oil Burner Components and Operation*
*- Heating System Installation Requirements*
*- Electrical Systems and Flame Safeguard Controls*
*- Venting and Draft Control Systems*
*- Safety Codes and TSSA Regulatory Compliance*
*- Troubleshooting and Maintenance Procedures*
Introduction
This examination assesses competency for Oil Burner Technician Level 2 certification in Ontario,
administered under Technical Standards and Safety Authority (TSSA) regulations. The exam evaluates
essential knowledge and skills required to install, service, troubleshoot, and maintain fuel oil burning
appliances with inputs not greater than 7 US gallons per hour. Candidates will encounter multiple-choice and
scenario-based questions covering foundational theory, applied professional knowledge, regulatory
compliance, ethics, and real-world decision-making. The assessment emphasizes practical application in
residential and commercial heating systems, including combustion analysis, electrical diagnostics, nozzle
selection, venting requirements, and flame safeguard control systems. Successful candidates demonstrate
ability to work safely while adhering to Ontario Regulation 215/01 and applicable codes.
,SECTION ONE: QUESTIONS 1–100
Question 1
What is the primary purpose of a barometric draft regulator in an oil-fired heating system?
A. To increase the combustion air supply to the burner
B. To maintain a constant negative draft in the combustion chamber
C. To filter particulates from the flue gas before it enters the chimney
D. To regulate the fuel oil flow rate to the nozzle
🟢 B. To maintain a constant negative draft in the combustion chamber
🔴 RATIONALE: A barometric draft regulator maintains consistent negative draft (typically -0.020 in WC or -5
Pa) in the combustion chamber by allowing dilution air to enter when draft becomes too strong, preventing
excessive heat loss up the chimney while ensuring proper venting of combustion gases.
Question 2
Which component atomizes oil into a fine spray for combustion in a high-pressure oil burner?
A. The primary air shutter
B. The photocell flame sensor
C. The oil burner nozzle
D. The barometric draft control
🟢 C. The oil burner nozzle
,🔴 RATIONALE: The oil burner nozzle is a precision-engineered component that atomizes fuel oil into tiny
droplets by forcing it through a small orifice under pressure (typically 100 psi), creating a spray pattern
essential for efficient combustion.
Question 3
What is the typical oxygen (O₂) content range for proper combustion in oil-fired power burners using No. 2 fuel
oil?
A. 1 to 3%
B. 4 to 7%
C. 8 to 10%
D. 11 to 14%
🟢 B. 4 to 7%
🔴 RATIONALE: According to combustion reference standards for oil-fired power burners using No. 2 fuel oil,
the proper oxygen content range is 4 to 7%, which indicates adequate air supply without excessive excess air
that would reduce efficiency.
Question 4
Under Ontario Regulation 215/01, what is the prerequisite certifi cation required to challenge the OBT-2
examination?
, A. Valid Gas Technician 3 (G.3) certificate
B. Valid Oil Burner Technician 3 (OBT-3) certificate
C. Two years of uncertifi ed field experience
D. Valid Oil Burner Technician 1 (OBT-1) certificate
🟢 B. Valid Oil Burner Technician 3 (OBT-3) certificate
🔴 RATIONALE: Per TSSA policies and Ontario Regulation 215/01, a candidate for OBT-2 must have a valid
Oil Burner Technician 3 (OBT-3) certificate as a prerequisite before being eligible to challenge the OBT-2
examination.
Question 5
What smoke number should modern oil-fired equipment achieve when properly adjusted?
A. Smoke number 5 or higher
B. Smoke number 3 to 4
C. Smoke number near zero
D. Smoke number 8 to 10
🟢 C. Smoke number near zero
🔴 RATIONALE: Modern oil-fired equipment should achieve a smoke number near zero when properly
adjusted. A smoke number higher than 3 indicates incomplete combustion requiring adjustment of air shutter
or nozzle replacement.
CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT
DOWNLOAD PDF
Core Domains
*- Fuel Oil Properties and Classification*
*- Combustion Theory and Analysis*
*- Oil Burner Components and Operation*
*- Heating System Installation Requirements*
*- Electrical Systems and Flame Safeguard Controls*
*- Venting and Draft Control Systems*
*- Safety Codes and TSSA Regulatory Compliance*
*- Troubleshooting and Maintenance Procedures*
Introduction
This examination assesses competency for Oil Burner Technician Level 2 certification in Ontario,
administered under Technical Standards and Safety Authority (TSSA) regulations. The exam evaluates
essential knowledge and skills required to install, service, troubleshoot, and maintain fuel oil burning
appliances with inputs not greater than 7 US gallons per hour. Candidates will encounter multiple-choice and
scenario-based questions covering foundational theory, applied professional knowledge, regulatory
compliance, ethics, and real-world decision-making. The assessment emphasizes practical application in
residential and commercial heating systems, including combustion analysis, electrical diagnostics, nozzle
selection, venting requirements, and flame safeguard control systems. Successful candidates demonstrate
ability to work safely while adhering to Ontario Regulation 215/01 and applicable codes.
,SECTION ONE: QUESTIONS 1–100
Question 1
What is the primary purpose of a barometric draft regulator in an oil-fired heating system?
A. To increase the combustion air supply to the burner
B. To maintain a constant negative draft in the combustion chamber
C. To filter particulates from the flue gas before it enters the chimney
D. To regulate the fuel oil flow rate to the nozzle
🟢 B. To maintain a constant negative draft in the combustion chamber
🔴 RATIONALE: A barometric draft regulator maintains consistent negative draft (typically -0.020 in WC or -5
Pa) in the combustion chamber by allowing dilution air to enter when draft becomes too strong, preventing
excessive heat loss up the chimney while ensuring proper venting of combustion gases.
Question 2
Which component atomizes oil into a fine spray for combustion in a high-pressure oil burner?
A. The primary air shutter
B. The photocell flame sensor
C. The oil burner nozzle
D. The barometric draft control
🟢 C. The oil burner nozzle
,🔴 RATIONALE: The oil burner nozzle is a precision-engineered component that atomizes fuel oil into tiny
droplets by forcing it through a small orifice under pressure (typically 100 psi), creating a spray pattern
essential for efficient combustion.
Question 3
What is the typical oxygen (O₂) content range for proper combustion in oil-fired power burners using No. 2 fuel
oil?
A. 1 to 3%
B. 4 to 7%
C. 8 to 10%
D. 11 to 14%
🟢 B. 4 to 7%
🔴 RATIONALE: According to combustion reference standards for oil-fired power burners using No. 2 fuel oil,
the proper oxygen content range is 4 to 7%, which indicates adequate air supply without excessive excess air
that would reduce efficiency.
Question 4
Under Ontario Regulation 215/01, what is the prerequisite certifi cation required to challenge the OBT-2
examination?
, A. Valid Gas Technician 3 (G.3) certificate
B. Valid Oil Burner Technician 3 (OBT-3) certificate
C. Two years of uncertifi ed field experience
D. Valid Oil Burner Technician 1 (OBT-1) certificate
🟢 B. Valid Oil Burner Technician 3 (OBT-3) certificate
🔴 RATIONALE: Per TSSA policies and Ontario Regulation 215/01, a candidate for OBT-2 must have a valid
Oil Burner Technician 3 (OBT-3) certificate as a prerequisite before being eligible to challenge the OBT-2
examination.
Question 5
What smoke number should modern oil-fired equipment achieve when properly adjusted?
A. Smoke number 5 or higher
B. Smoke number 3 to 4
C. Smoke number near zero
D. Smoke number 8 to 10
🟢 C. Smoke number near zero
🔴 RATIONALE: Modern oil-fired equipment should achieve a smoke number near zero when properly
adjusted. A smoke number higher than 3 indicates incomplete combustion requiring adjustment of air shutter
or nozzle replacement.
