G2 Gas Technician Module 17 UPDATED
ACTUAL Exam Questions and CORRECT
Answers
What are the factors governing a conversion? - CORRECT ANSWER - Availability of
gas, efficiency if converted, access to combustible air, satisfactory ductwork, can a chimney liner
be installed, clearances from combustibles, manufactures recommendations, if a water heater is
also being installed (common vent or power vent), and age of the appliance
Oil fired furnaces are recommended not to be converted at a certain age what is age is this? -
CORRECT ANSWER - 10 years clause 4.3.5
What are the responsibilities of the installer when converting? - CORRECT ANSWER -
Determine that it can accept gas and will operate satisfactory for a reasonable length of time.
What must be done when converting a boiler? - CORRECT ANSWER - 1. Check for
revirtible flue; center line must be at leas 12" above burner port
2. Visually inspect for leaks
3. Open drain at bottom and flush until water is clear
4. Sediment can hide a leak at the bottom
Where must a pressure relief drop tube be located on a boiler? - CORRECT ANSWER -
The pressure relief tube must be withing 12" of the floor
What must be done if a warm air furnace does not have a revertible flue? - CORRECT
ANSWER - Center line of the flue collar is 12" above burner port and barometric draft
regulator can be installed so relief opening is 12" above the highest flue passage.
Can you convert a forced air furnace with a secondary heating surface on the suction side of the
air blower? - CORRECT ANSWER - No. Unless the heating surface consists of a single
, cylinder flue pope passing directly from the primary heat exchange to the flue collar and has a
continuously gas tight welded joint.
How do you check a heat exchanger? - CORRECT ANSWER - 1. Smoke in fire chamber
(plug the flue outlet)
2. Light and mirror, check for cracks
3. warping and distortion of heat exchanger
4. Rust Spots
5. Gaskets on joints.
How do you determine the firing rate of a replacement burner? - CORRECT ANSWER -
1. Heat loss calculations of the building
2. Input or output on rating plate
3. Nozzle size in the burner
How do you calculate nozzle size in an oil burner? - CORRECT ANSWER - Gallons per
hour time 1 US galon of oil (140 000 btu)
ie: 0.75 h x 140 000 btu = 105 000 btu/h
How many btus is 1 Boiler Horsepower? - CORRECT ANSWER - 33 475 btuh
What are the three types of combustion chamber designs? - CORRECT ANSWER - 1.
Updraft
2. Semi-revertible
3. Revertible - conversion prohibited
What types of burners can be used in a revertible flue? - CORRECT ANSWER -
Atmospheric is not allowed, Fan assisted can be used but must have spark ignition, pre-purge of
combustion air and automatic valve with dual safety functions.
ACTUAL Exam Questions and CORRECT
Answers
What are the factors governing a conversion? - CORRECT ANSWER - Availability of
gas, efficiency if converted, access to combustible air, satisfactory ductwork, can a chimney liner
be installed, clearances from combustibles, manufactures recommendations, if a water heater is
also being installed (common vent or power vent), and age of the appliance
Oil fired furnaces are recommended not to be converted at a certain age what is age is this? -
CORRECT ANSWER - 10 years clause 4.3.5
What are the responsibilities of the installer when converting? - CORRECT ANSWER -
Determine that it can accept gas and will operate satisfactory for a reasonable length of time.
What must be done when converting a boiler? - CORRECT ANSWER - 1. Check for
revirtible flue; center line must be at leas 12" above burner port
2. Visually inspect for leaks
3. Open drain at bottom and flush until water is clear
4. Sediment can hide a leak at the bottom
Where must a pressure relief drop tube be located on a boiler? - CORRECT ANSWER -
The pressure relief tube must be withing 12" of the floor
What must be done if a warm air furnace does not have a revertible flue? - CORRECT
ANSWER - Center line of the flue collar is 12" above burner port and barometric draft
regulator can be installed so relief opening is 12" above the highest flue passage.
Can you convert a forced air furnace with a secondary heating surface on the suction side of the
air blower? - CORRECT ANSWER - No. Unless the heating surface consists of a single
, cylinder flue pope passing directly from the primary heat exchange to the flue collar and has a
continuously gas tight welded joint.
How do you check a heat exchanger? - CORRECT ANSWER - 1. Smoke in fire chamber
(plug the flue outlet)
2. Light and mirror, check for cracks
3. warping and distortion of heat exchanger
4. Rust Spots
5. Gaskets on joints.
How do you determine the firing rate of a replacement burner? - CORRECT ANSWER -
1. Heat loss calculations of the building
2. Input or output on rating plate
3. Nozzle size in the burner
How do you calculate nozzle size in an oil burner? - CORRECT ANSWER - Gallons per
hour time 1 US galon of oil (140 000 btu)
ie: 0.75 h x 140 000 btu = 105 000 btu/h
How many btus is 1 Boiler Horsepower? - CORRECT ANSWER - 33 475 btuh
What are the three types of combustion chamber designs? - CORRECT ANSWER - 1.
Updraft
2. Semi-revertible
3. Revertible - conversion prohibited
What types of burners can be used in a revertible flue? - CORRECT ANSWER -
Atmospheric is not allowed, Fan assisted can be used but must have spark ignition, pre-purge of
combustion air and automatic valve with dual safety functions.
