Licensed Oil Burner Technician Exam|| with questions and
correct answers graded A+|| latest rationale 2024/2025
What does L1 mean in electrical wiring? - CORRECT ANSWERS/ hot or line voltage
What does L2 mean in a 115 volt circuit? - CORRECT ANSWERS/ neutral
How far must oil storage be from an electrical panel? - CORRECT ANSWERS/ 3 feet
What does the letter "N" mean? - CORRECT ANSWERS/ Neutral
What color wire is used for L1? - CORRECT ANSWERS/ Black
What color wire is used for L2? - CORRECT ANSWERS/ White
What color wire is used for "N"? - CORRECT ANSWERS/ White
What is the fuse size in an oil burner circuit? - CORRECT ANSWERS/ 15 amp
What size wire is used in an oil burner circuit? - CORRECT ANSWERS/ 14 gauge
What is a series circuit? - CORRECT ANSWERS/ one path for electricity to follow
Define a parallel circuit? - CORRECT ANSWERS/ more than one path for the electricity to follow
What is the limit device used in a steam system? - CORRECT ANSWERS/ Pressuretrol
,Wire with green insulation is used for what? - CORRECT ANSWERS/ grounding
A 15 amp electrical circuit cannot have a continuous load of more than _______amps? - CORRECT
ANSWERS/ 12 amps
What is a short circuit? - CORRECT ANSWERS/ power back to source with no load
T/F Limit switches are wired using L2? - CORRECT ANSWERS/ False
Can a thermal switch be wired on L2? - CORRECT ANSWERS/ No
What is the purpose of a combustion chamber? - CORRECT ANSWERS/ to hold heat and improve
combustion
What happens when an oil flame touches a cold surface? - CORRECT ANSWERS/ It causes
impingement
What is draft? - CORRECT ANSWERS/ air in motion
Why do we use a barometric damper? - CORRECT ANSWERS/ to regulate the draft and make it
constant
What is required on a unit with a power operated vent? - CORRECT ANSWERS/ an air proving switch
Air leaks in the combustion chamber will cause what? - CORRECT ANSWERS/ poor efficiency
What is the maximum safe CO reading indoors? - CORRECT ANSWERS/ 9 ppm
Sulfuric acid is created when the stack temp drops below ____________degrees F. - CORRECT
ANSWERS/ 250 degrees
, A burner connected to a chimney that has -.01 of draft when cold will need to be fitted with a
_________. - CORRECT ANSWERS/ draft inducer
Will an increase in excess air lower or raise the stack temperature? - CORRECT ANSWERS/ raise it
Will an increase in excess air lower or raise the CO2 reading? - CORRECT ANSWERS/ lower it
What is a good CO2 reading in a boiler with a retention head burner? - CORRECT ANSWERS/ 10-12%
(11%)
A draft of -.03 to -.04"wc over the fire, and -.01 to -.02"wc at the breach is considered good. - CORRECT
ANSWERS/ False: over the fire draft -.01"wc to -.02"wc, at the breach -.04"wc
Draft measurements are taken in... - CORRECT ANSWERS/ inches of water column
What will happen if a power vent fails to start or shuts down during operation? - CORRECT ANSWERS/
Burner will lock out
What are the proper draft settings over the fire and at the breach respectively? - CORRECT ANSWERS/
-.02 and -.04"wc
Per code, what three things are needed along with a power venter? - CORRECT ANSWERS/ proving
switch, damper, post purge
How far off the ground should a power venter terminal be? (minimum distance) - CORRECT ANSWERS/
1 foot
How far horizontally from a door or window should a power venter terminal be? (minimum distance) -
CORRECT ANSWERS/ 4 feet
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