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ASSACHUSETTS OIL BURNER LICENSE
NEWEST 2025-2026 ACTUAL EXAM TEST
BANK 350 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
Low boiler water temperature in a hydronic hot water system
may be caused by? - CORRECT ANSWER✔✔ Undersized oil
burner nozzles
Delayed opening oil valves are used to? - CORRECT 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: - CORRECT ANSWER✔✔ A backflow prevention
device
How can a damaged heat exchanger be detected on a forced
warm air system? - CORRECT 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? - CORRECT
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ANSWER✔✔ To maintain temperature for domestic hot water
On a steam system, a plugged siphon loop can have what affect
on the heating system? - CORRECT 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? -
CORRECT ANSWER✔✔ The boiler going off on high limit before
reaching the minimum circulator temperature
An advantage of flame retention burner is - CORRECT
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 - CORRECT
ANSWER✔✔ Combustion air
Dirt or lint buildup in the bevel of the burner fan blades will -
CORRECT ANSWER✔✔ Reduce the amount of combustion air
, 3 | Page
To change the air ratio for different firing rates with an
adjustable head burner you - CORRECT ANSWER✔✔ Adjust the
position of the drawer assembly in the Air tube
All petroleum products are chemical compounds of - CORRECT
ANSWER✔✔ Hydrogen and carbon
1 gallon of #2 oil contains approximately how many BTU's? -
CORRECT ANSWER✔✔ 140,000 BTU's
Flashpoint of a fuel is an indication of - CORRECT ANSWER✔✔
The lowest temperature at which the fuel will flash but not
continue to burn
The pour point of #2 oil - CORRECT 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 - CORRECT ANSWER✔✔
10,000 gallons
Is heating oil gets colder its viscosity (thickness): - CORRECT
ASSACHUSETTS OIL BURNER LICENSE
NEWEST 2025-2026 ACTUAL EXAM TEST
BANK 350 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
Low boiler water temperature in a hydronic hot water system
may be caused by? - CORRECT ANSWER✔✔ Undersized oil
burner nozzles
Delayed opening oil valves are used to? - CORRECT 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: - CORRECT ANSWER✔✔ A backflow prevention
device
How can a damaged heat exchanger be detected on a forced
warm air system? - CORRECT 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? - CORRECT
,2 | Page
ANSWER✔✔ To maintain temperature for domestic hot water
On a steam system, a plugged siphon loop can have what affect
on the heating system? - CORRECT 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? -
CORRECT ANSWER✔✔ The boiler going off on high limit before
reaching the minimum circulator temperature
An advantage of flame retention burner is - CORRECT
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 - CORRECT
ANSWER✔✔ Combustion air
Dirt or lint buildup in the bevel of the burner fan blades will -
CORRECT ANSWER✔✔ Reduce the amount of combustion air
, 3 | Page
To change the air ratio for different firing rates with an
adjustable head burner you - CORRECT ANSWER✔✔ Adjust the
position of the drawer assembly in the Air tube
All petroleum products are chemical compounds of - CORRECT
ANSWER✔✔ Hydrogen and carbon
1 gallon of #2 oil contains approximately how many BTU's? -
CORRECT ANSWER✔✔ 140,000 BTU's
Flashpoint of a fuel is an indication of - CORRECT ANSWER✔✔
The lowest temperature at which the fuel will flash but not
continue to burn
The pour point of #2 oil - CORRECT 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 - CORRECT ANSWER✔✔
10,000 gallons
Is heating oil gets colder its viscosity (thickness): - CORRECT
