MASSACHUSETTS OIL BURNER PRACTICE EXAM VERSION 1&2
COMPLETE 250 QUESTIONS AND CORRECT VERIFIED
ANSWERS LATEST UPDATED VERSIONS 2024-2025
VERSION 1
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.
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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
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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
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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
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