MASSACHUSETTS OIL BURNER LICENCE LATEST EXAM
2025 WITH QUESTIONS AND VERIFIED CORRECT
ANSWERS/ ALREADY GRADED A++
The cross connection between two supply tanks shall not exceed? -
ANSWER 660 gallons
When is an automatic draft control not required? - ANSWER When the
equipment is designed to control the draft.
Combustion performance testing can indicate: - ANSWER Improper air oil
mixture, too much combustion air, and low pump pressure.
If a second oil-burning appliance is installed in a single chimney, you must
insure: - ANSWER Sufficient draft is available for safe operation of all
connected equipment.
Delayed ignition can be caused by: - ANSWER Weak ignition transformer
You should replace the oil burner nozzle with: - ANSWER The
manufacturers recommended nozzle spray pattern and spray angle.
Viscosity problems can be corrected by: - ANSWER Decreasing the nozzle
size and increasing the pump pressure accordingly
The minimum operating pressure of an oil pump is: - ANSWER 100 PSI
If a stack relay fails you, must? - ANSWER Replace it with an approved
type controller
Aquastats are normally found on what type of heating systems? - ANSWER
Hydronic
Airstats are found on what type of heating systems? - ANSWER Forced
warm air systems
Under sized returns on a warm air system can result in what? - ANSWER
Short cycling of the oil burner
,Incorrect nozzle selection in regards to gallon per hour, can result in what
problems in a steam system? - ANSWER Some radiators not heating
quickly enough
Low boiler water temperature in a hydronic hot water system may be
caused by? - ANSWER Undersized oil burner nozzles
Delayed opening oil valves are used to? - ANSWER Allow oil pump to
come up to speed
If a steam boiler is to be installed with an automatic feeder it must also
have: - ANSWER A backflow prevention device
How can a damaged heat exchanger be detected on a forced warm air
system? - ANSWER With a smoke trace candle
If a high limit is installed to prevent high boiler water temperature, what is
the function of the low limit? - ANSWER To maintain temperature for
domestic hot water
On a steam system, a plugged siphon loop can have what affect on the
heating system? - ANSWER Insufficient heat in the living space
On a triple acting aquastat a minimum of 20 degrees is recommend
between the high and low limit, this will prevent? - ANSWER The boiler
going off on high limit before reaching the minimum circulator temperature
An advantage of flame retention burner is - ANSWER Their high static
pressure enables boilers and furnaces with tighter more efficient heat
exchange passages
The key final adjustment for most oil burners is - ANSWER Combustion air
Dirt or lint buildup in the bevel of the burner fan blades will - ANSWER
Reduce the amount of combustion air
To change the air ratio for different firing rates with an adjustable head
burner you - ANSWER Adjust the position of the drawer assembly in the Air
tube
,All petroleum products are chemical compounds of - ANSWER Hydrogen
and carbon
1 gallon of #2 oil contains approximately how many BTU's? - ANSWER
140,000 BTU's
Flashpoint of a fuel is an indication of - ANSWER The lowest temperature
at which the fuel will flash but not continue to burn
The pour point of #2 oil - ANSWER Can be lowered by blending with
kerosene, can be lowered with fuel additives, and is the lowest temperature
at which it will flow
Maximum fuel allowed without a license - ANSWER 10,000 gallons
Is heating oil gets colder its viscosity (thickness): - ANSWER Increases
Sulfuric acid in combustion gases can: - ANSWER Damon's the flue lines, it
holds in the flue pipe, and create a scale buildup in the heat exchanger
The home for bacterial growth and sludge in the bottom of the oil tank is -
ANSWER Water
To ensure clean, uncontaminated fuel reaches the oil burner you must -
ANSWER Install tanks properly, regularly inspect and fix minor defects
before they lead to major problems, and install a quality oil filter
Water in oil tanks come from - ANSWER Condensation, loose or missing fill
and vent caps, and failing to drain water from a tank before installation
When installing an oil tank be sure: - ANSWER The fill and vent lines are
pitched towards the tank, to install a vent alarm and a tank gauge, and to
install an oil filter
Oil lines buried in concrete should be - ANSWER Sleeved in plastic or PVC
pipe with no fittings below the floor
Fuel units (oil pumps) preform the following functions - ANSWER Move oil
from the tank to the burner and deliver oil at a constant regulated pressure
to the nozzle
, The best way to clear a clogged oil line is to - ANSWER Use a hand pump
to pull the blockage out
If the oil level in the tank is 4 feet below the fuel unit in 10 feet away, the
approximate vacuum should be - ANSWER 5 - 6 inches
If the operating vacuum reading a significantly above the calculated
vacuum, you probably have a - ANSWER Clogged oil filter
If the operating vacuum reading is significantly less than the calculated
vacuum, you probably have a - ANSWER Suction line leak
It is best to connect your unit as a one pipe system instead of a 2 pipe
system because - ANSWER One pipe leads to longer filter life and
eliminates worries about leaking return lines
A fuel de-aerator: - ANSWER Eliminates the need for a return line back to
the tank
A cause of pulsating oil pump pressure and a pulsating fire is - ANSWER
Air leaks in the suction line
Increasing the fuel pump pressure will - ANSWER Increase the flow rate
The purpose of an oil burner nozzle is to - ANSWER Automize the oil,
provide a pattern of oil spray, and meter the amount of oil burned
When replacing nozzle - ANSWER Follow the manufacturer's
recommendations
To reduce combustion problems caused by cold oil - ANSWER Increase
the pump pressure, install a nozzle line pre-heater, and use additives or
kerosene to lower viscosity
Nozzle after trip can be caused by - ANSWER a defective pressure
regulating valve, air in the nozzle line, and oil expansion in the nozzle after
shut down
The flow rate stamped on the nozzle is based on: - ANSWER 100 PSI
2025 WITH QUESTIONS AND VERIFIED CORRECT
ANSWERS/ ALREADY GRADED A++
The cross connection between two supply tanks shall not exceed? -
ANSWER 660 gallons
When is an automatic draft control not required? - ANSWER When the
equipment is designed to control the draft.
Combustion performance testing can indicate: - ANSWER Improper air oil
mixture, too much combustion air, and low pump pressure.
If a second oil-burning appliance is installed in a single chimney, you must
insure: - ANSWER Sufficient draft is available for safe operation of all
connected equipment.
Delayed ignition can be caused by: - ANSWER Weak ignition transformer
You should replace the oil burner nozzle with: - ANSWER The
manufacturers recommended nozzle spray pattern and spray angle.
Viscosity problems can be corrected by: - ANSWER Decreasing the nozzle
size and increasing the pump pressure accordingly
The minimum operating pressure of an oil pump is: - ANSWER 100 PSI
If a stack relay fails you, must? - ANSWER Replace it with an approved
type controller
Aquastats are normally found on what type of heating systems? - ANSWER
Hydronic
Airstats are found on what type of heating systems? - ANSWER Forced
warm air systems
Under sized returns on a warm air system can result in what? - ANSWER
Short cycling of the oil burner
,Incorrect nozzle selection in regards to gallon per hour, can result in what
problems in a steam system? - ANSWER Some radiators not heating
quickly enough
Low boiler water temperature in a hydronic hot water system may be
caused by? - ANSWER Undersized oil burner nozzles
Delayed opening oil valves are used to? - ANSWER Allow oil pump to
come up to speed
If a steam boiler is to be installed with an automatic feeder it must also
have: - ANSWER A backflow prevention device
How can a damaged heat exchanger be detected on a forced warm air
system? - ANSWER With a smoke trace candle
If a high limit is installed to prevent high boiler water temperature, what is
the function of the low limit? - ANSWER To maintain temperature for
domestic hot water
On a steam system, a plugged siphon loop can have what affect on the
heating system? - ANSWER Insufficient heat in the living space
On a triple acting aquastat a minimum of 20 degrees is recommend
between the high and low limit, this will prevent? - ANSWER The boiler
going off on high limit before reaching the minimum circulator temperature
An advantage of flame retention burner is - ANSWER Their high static
pressure enables boilers and furnaces with tighter more efficient heat
exchange passages
The key final adjustment for most oil burners is - ANSWER Combustion air
Dirt or lint buildup in the bevel of the burner fan blades will - ANSWER
Reduce the amount of combustion air
To change the air ratio for different firing rates with an adjustable head
burner you - ANSWER Adjust the position of the drawer assembly in the Air
tube
,All petroleum products are chemical compounds of - ANSWER Hydrogen
and carbon
1 gallon of #2 oil contains approximately how many BTU's? - ANSWER
140,000 BTU's
Flashpoint of a fuel is an indication of - ANSWER The lowest temperature
at which the fuel will flash but not continue to burn
The pour point of #2 oil - ANSWER Can be lowered by blending with
kerosene, can be lowered with fuel additives, and is the lowest temperature
at which it will flow
Maximum fuel allowed without a license - ANSWER 10,000 gallons
Is heating oil gets colder its viscosity (thickness): - ANSWER Increases
Sulfuric acid in combustion gases can: - ANSWER Damon's the flue lines, it
holds in the flue pipe, and create a scale buildup in the heat exchanger
The home for bacterial growth and sludge in the bottom of the oil tank is -
ANSWER Water
To ensure clean, uncontaminated fuel reaches the oil burner you must -
ANSWER Install tanks properly, regularly inspect and fix minor defects
before they lead to major problems, and install a quality oil filter
Water in oil tanks come from - ANSWER Condensation, loose or missing fill
and vent caps, and failing to drain water from a tank before installation
When installing an oil tank be sure: - ANSWER The fill and vent lines are
pitched towards the tank, to install a vent alarm and a tank gauge, and to
install an oil filter
Oil lines buried in concrete should be - ANSWER Sleeved in plastic or PVC
pipe with no fittings below the floor
Fuel units (oil pumps) preform the following functions - ANSWER Move oil
from the tank to the burner and deliver oil at a constant regulated pressure
to the nozzle
, The best way to clear a clogged oil line is to - ANSWER Use a hand pump
to pull the blockage out
If the oil level in the tank is 4 feet below the fuel unit in 10 feet away, the
approximate vacuum should be - ANSWER 5 - 6 inches
If the operating vacuum reading a significantly above the calculated
vacuum, you probably have a - ANSWER Clogged oil filter
If the operating vacuum reading is significantly less than the calculated
vacuum, you probably have a - ANSWER Suction line leak
It is best to connect your unit as a one pipe system instead of a 2 pipe
system because - ANSWER One pipe leads to longer filter life and
eliminates worries about leaking return lines
A fuel de-aerator: - ANSWER Eliminates the need for a return line back to
the tank
A cause of pulsating oil pump pressure and a pulsating fire is - ANSWER
Air leaks in the suction line
Increasing the fuel pump pressure will - ANSWER Increase the flow rate
The purpose of an oil burner nozzle is to - ANSWER Automize the oil,
provide a pattern of oil spray, and meter the amount of oil burned
When replacing nozzle - ANSWER Follow the manufacturer's
recommendations
To reduce combustion problems caused by cold oil - ANSWER Increase
the pump pressure, install a nozzle line pre-heater, and use additives or
kerosene to lower viscosity
Nozzle after trip can be caused by - ANSWER a defective pressure
regulating valve, air in the nozzle line, and oil expansion in the nozzle after
shut down
The flow rate stamped on the nozzle is based on: - ANSWER 100 PSI
