CT Gas & Oil Burner Technician Exam
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A|
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1. What is the primary purpose of a burner’s flame safeguard
control?
A. To increase fuel pressure
B. To regulate room temperature
C. To circulate heated air
D. To monitor the burner flame and shut down the system if safe
combustion is not established
Rationale: A flame safeguard control is a critical safety device. It
monitors the presence and quality of the burner flame during startup
and operation. If ignition does not occur within the permitted trial-for-
ignition period or the flame is lost during operation, the control shuts
off the fuel supply to prevent accumulation of unburned fuel.
, 2. Which fuel is commonly used in an oil-fired residential heating
system?
A. Natural gas
B. Propane
C. No. 2 heating oil
D. Kerosene only
Rationale: No. 2 heating oil is a common fuel for residential and light
commercial oil-fired heating equipment. It is stored in a tank and
delivered to the burner through a fuel pump and nozzle assembly.
3. What is the main function of an oil burner nozzle?
A. To measure chimney draft
B. To cool the combustion chamber
C. To ignite the fuel directly
D. To meter and atomize fuel into a spray pattern
Rationale: The nozzle meters a precise amount of oil and atomizes it
into small droplets. Proper atomization allows the fuel to mix
effectively with combustion air, promoting stable ignition and
efficient combustion.
4. What component provides the high-voltage spark required to
ignite an oil burner?
,A. Aquastat
B. Circulator
C. Ignition transformer
D. Draft regulator
Rationale: An oil burner ignition transformer produces the high
voltage needed to create an electrical arc across the electrodes. The
arc ignites the atomized oil leaving the burner nozzle.
5. A burner that produces excessive soot is most likely experiencing
which condition?
A. Excessive combustion air
B. Insufficient combustion air
C. Excessive water pressure
D. Low thermostat temperature
Rationale: Incomplete combustion caused by inadequate combustion
air can produce soot and smoke. Other causes may include an
incorrect nozzle, poor draft, dirty burner components, or improper
burner adjustment.
6. What is the primary purpose of a draft regulator on an oil-fired
heating system?
, A. To increase fuel pressure
B. To control thermostat voltage
C. To maintain relatively stable chimney draft
D. To increase circulating-water pressure
Rationale: A draft regulator, also called a barometric damper, helps
stabilize draft through the appliance and chimney. Stable draft
supports proper combustion and helps prevent excessive or
inadequate airflow through the combustion chamber.
7. What should be checked first when a burner fails to operate?
A. Replace the heat exchanger
B. Replace the fuel tank
C. Verify that electrical power and the control circuit are available
D. Increase the nozzle size
Rationale: Basic troubleshooting begins with confirming that the
equipment has power and that the operating controls are calling for
heat. Checking these fundamentals prevents unnecessary replacement
of expensive components.
8. What is the purpose of a fuel strainer in an oil-burning system?
A. To increase oil temperature
B. To atomize oil
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A|
Instant Download Pdf
1. What is the primary purpose of a burner’s flame safeguard
control?
A. To increase fuel pressure
B. To regulate room temperature
C. To circulate heated air
D. To monitor the burner flame and shut down the system if safe
combustion is not established
Rationale: A flame safeguard control is a critical safety device. It
monitors the presence and quality of the burner flame during startup
and operation. If ignition does not occur within the permitted trial-for-
ignition period or the flame is lost during operation, the control shuts
off the fuel supply to prevent accumulation of unburned fuel.
, 2. Which fuel is commonly used in an oil-fired residential heating
system?
A. Natural gas
B. Propane
C. No. 2 heating oil
D. Kerosene only
Rationale: No. 2 heating oil is a common fuel for residential and light
commercial oil-fired heating equipment. It is stored in a tank and
delivered to the burner through a fuel pump and nozzle assembly.
3. What is the main function of an oil burner nozzle?
A. To measure chimney draft
B. To cool the combustion chamber
C. To ignite the fuel directly
D. To meter and atomize fuel into a spray pattern
Rationale: The nozzle meters a precise amount of oil and atomizes it
into small droplets. Proper atomization allows the fuel to mix
effectively with combustion air, promoting stable ignition and
efficient combustion.
4. What component provides the high-voltage spark required to
ignite an oil burner?
,A. Aquastat
B. Circulator
C. Ignition transformer
D. Draft regulator
Rationale: An oil burner ignition transformer produces the high
voltage needed to create an electrical arc across the electrodes. The
arc ignites the atomized oil leaving the burner nozzle.
5. A burner that produces excessive soot is most likely experiencing
which condition?
A. Excessive combustion air
B. Insufficient combustion air
C. Excessive water pressure
D. Low thermostat temperature
Rationale: Incomplete combustion caused by inadequate combustion
air can produce soot and smoke. Other causes may include an
incorrect nozzle, poor draft, dirty burner components, or improper
burner adjustment.
6. What is the primary purpose of a draft regulator on an oil-fired
heating system?
, A. To increase fuel pressure
B. To control thermostat voltage
C. To maintain relatively stable chimney draft
D. To increase circulating-water pressure
Rationale: A draft regulator, also called a barometric damper, helps
stabilize draft through the appliance and chimney. Stable draft
supports proper combustion and helps prevent excessive or
inadequate airflow through the combustion chamber.
7. What should be checked first when a burner fails to operate?
A. Replace the heat exchanger
B. Replace the fuel tank
C. Verify that electrical power and the control circuit are available
D. Increase the nozzle size
Rationale: Basic troubleshooting begins with confirming that the
equipment has power and that the operating controls are calling for
heat. Checking these fundamentals prevents unnecessary replacement
of expensive components.
8. What is the purpose of a fuel strainer in an oil-burning system?
A. To increase oil temperature
B. To atomize oil
