Page 1 of 104
Ontario Oil Burner Technician 2 (OBT2) Certification
Exam ACTUAL EXAM COMPLETE QUESTIONS AND
CORRECT ANSWERS LATEST UPDATE THIS YEAR
Ontario Oil Burner Technician 2 (OBT2) Certification Exam
Technical Standards and Safety Authority
ACTUAL EXAM COVERAGE (ALL CONTENT AREAS)
1. Oil Burner System Fundamentals
• Fuel oil properties (No. 1, No. 2 oil)
• Combustion principles (air-to-fuel ratio, flame stability)
• Burner types (pressure, gun-type, atomizing burners)
• Heat transfer basics
2. Burner Components & Operation
• Fuel pumps, nozzles, and strainers
• Ignition systems (electrodes, transformers)
• Air supply systems (fans, dampers)
• Flame retention heads and controls
3. Combustion Efficiency & Adjustments
• Smoke testing (Bacharach scale)
• Draft measurement and control
• CO₂ and O₂ readings
• Flame adjustment procedures
4. Electrical Controls & Safety Circuits
• Primary safety controls (cad cell, flame sensor)
• Limit controls and pressure switches
• Safety lockout systems
• Wiring diagrams and troubleshooting
5. Venting & Chimney Systems
• Natural draft vs mechanical draft systems
• Flue gas movement
• Chimney sizing and vent blockage issues
• Draft regulators
6. Maintenance & Troubleshooting
• No-start conditions
• Flame failure diagnostics
• Poor combustion symptoms
• Routine servicing procedures
7. Safety & Codes
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• Fuel oil handling safety
• Carbon monoxide hazards
• Fire prevention procedures
• Ontario fuel burning equipment regulations
8. Measurement & Testing Instruments
• Manometers (draft testing)
• Combustion analyzers
• Pressure gauges
• Smoke testers
1.
A technician observes a yellow smoky flame in an oil burner system during operation. What is the most
likely cause?
A. Excess air supply
B. Insufficient combustion air
C. High oil pressure
D. Clean nozzle
Answer: B
Rationale: Yellow smoky flames typically indicate incomplete combustion due to insufficient air supply.
2.
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An oil burner repeatedly locks out shortly after ignition despite normal startup. What should be checked
first?
A. Oil tank size
B. Flame sensor (cad cell) operation
C. Chimney color
D. Room temperature
Answer: B
3.
A burner shows delayed ignition with small puff-back at startup. What is the most likely cause?
A. Excess air
B. Improper electrode gap or positioning
C. Clean nozzle
D. High draft
Answer: B
4.
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A technician measures low draft in the chimney system. What is the likely effect on combustion?
A. Improved efficiency
B. Poor combustion and soot formation
C. Higher flame stability
D. Increased oxygen
Answer: B
5.
An oil burner flame is pulsating and unstable during operation. What is the most likely cause?
A. Stable airflow
B. Air-fuel mixture imbalance
C. Clean filter
D. Proper ignition
Answer: B
6.
Ontario Oil Burner Technician 2 (OBT2) Certification
Exam ACTUAL EXAM COMPLETE QUESTIONS AND
CORRECT ANSWERS LATEST UPDATE THIS YEAR
Ontario Oil Burner Technician 2 (OBT2) Certification Exam
Technical Standards and Safety Authority
ACTUAL EXAM COVERAGE (ALL CONTENT AREAS)
1. Oil Burner System Fundamentals
• Fuel oil properties (No. 1, No. 2 oil)
• Combustion principles (air-to-fuel ratio, flame stability)
• Burner types (pressure, gun-type, atomizing burners)
• Heat transfer basics
2. Burner Components & Operation
• Fuel pumps, nozzles, and strainers
• Ignition systems (electrodes, transformers)
• Air supply systems (fans, dampers)
• Flame retention heads and controls
3. Combustion Efficiency & Adjustments
• Smoke testing (Bacharach scale)
• Draft measurement and control
• CO₂ and O₂ readings
• Flame adjustment procedures
4. Electrical Controls & Safety Circuits
• Primary safety controls (cad cell, flame sensor)
• Limit controls and pressure switches
• Safety lockout systems
• Wiring diagrams and troubleshooting
5. Venting & Chimney Systems
• Natural draft vs mechanical draft systems
• Flue gas movement
• Chimney sizing and vent blockage issues
• Draft regulators
6. Maintenance & Troubleshooting
• No-start conditions
• Flame failure diagnostics
• Poor combustion symptoms
• Routine servicing procedures
7. Safety & Codes
, Page 2 of 104
• Fuel oil handling safety
• Carbon monoxide hazards
• Fire prevention procedures
• Ontario fuel burning equipment regulations
8. Measurement & Testing Instruments
• Manometers (draft testing)
• Combustion analyzers
• Pressure gauges
• Smoke testers
1.
A technician observes a yellow smoky flame in an oil burner system during operation. What is the most
likely cause?
A. Excess air supply
B. Insufficient combustion air
C. High oil pressure
D. Clean nozzle
Answer: B
Rationale: Yellow smoky flames typically indicate incomplete combustion due to insufficient air supply.
2.
, Page 3 of 104
An oil burner repeatedly locks out shortly after ignition despite normal startup. What should be checked
first?
A. Oil tank size
B. Flame sensor (cad cell) operation
C. Chimney color
D. Room temperature
Answer: B
3.
A burner shows delayed ignition with small puff-back at startup. What is the most likely cause?
A. Excess air
B. Improper electrode gap or positioning
C. Clean nozzle
D. High draft
Answer: B
4.
, Page 4 of 104
A technician measures low draft in the chimney system. What is the likely effect on combustion?
A. Improved efficiency
B. Poor combustion and soot formation
C. Higher flame stability
D. Increased oxygen
Answer: B
5.
An oil burner flame is pulsating and unstable during operation. What is the most likely cause?
A. Stable airflow
B. Air-fuel mixture imbalance
C. Clean filter
D. Proper ignition
Answer: B
6.
