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OIL BURNER LICENSE EXAM AND PRACTICE
2025/2026 NEW UPDATE/ OIL BURNER LICENSE
ACTUAL EXAM QUESTIONS AND CORRECT
SOLUTIONS GUARANTEED PASS
All fill and vent piping shall be made of: - ANSWER- - Steel
- Brass
- Pipe-malleable Piping used in the installation of oil burners? - ANSWER- 3/8 (1/2 O.D.) LWCO are required on all steam and water boilers over ______________________ BTU's - ANSWER- 400, True or False: An inground tank inspection pit can be in a basement - ANSWER- False Liquid tight silver ramp should be at least _________ high - ANSWER- 6" When do you need a draft regulator? - ANSWER- "As with all oil heat appliances always follow manufactures instructions" 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 so designed to control the draft Combustion performance testing can indicate: - ANSWER- - Improper air oil mixture
- Too much combustion air
- Low pump pressure If a second oil-burning appliance is installed in a single chimney, you must ensure: - 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 type controller fails, you must: - ANSWER- Replace it with an approved type controller Aquastats are normally found on what type of heating system? - ANSWER- Hydronic
On a no-heat call, a cad-cell primary control fires when TT is jumped out because: - ANSWER- The thermostat or thermostat wires are no good What is the gauge of a 275g above-ground tank? - ANSWER- 12 g True or False: The maximum amount of fuel may be delivered without a permit to store in effect provided that application has been made in accordance with code. - ANSWER- True Vent pipe size for a 500 g tank should be: - ANSWER- 1-1/4" True or False: A supply tank may be supported by any ridge support - ANSWER- False Stack switch relays can no longer be used in installations or replacement because: - ANSWER- Their lock-out time is no longer the code requirement "In-step" means: - ANSWER- The primary control start circuit is closed On a no heat call on a hot water system, the oil burner is off on a high-limit, but the circulator is not running because: - ANSWER- - The reverse is open
- The circulator motor is burned out
- The switching relay is faulty
The burner operates but there is no combustion because: - ANSWER- There is too much air True or False: On a replacement steam boiler installation, you should pipe full-size risers to the header - ANSWER- False What is the best way to remove surface oil? - ANSWER- Skimming What is a safety control? - ANSWER- Any control used to prevent unsafe operation of the controlled equipment What is a draft booster? - ANSWER- Power operated fan installed in the chimney connector to increase natural draft What is a "confined space?" - ANSWER- Any space whose volume is less than 50 cubic feet per 1000 BTU's of all fuel burning equipment What is "installation?" - ANSWER- Complete and ready for operation of any oil-burning appliance The minimum distance a power vent may terminate above the finish grade is? - ANSWER- One-foot The minimum distance a power vent may terminate from a door, window or gravity air intake is? - ANSWER- 4-feet
One advantage of high static pressure burners is: - ANSWER- They enable boiler and furnace manufacturers to design more efficient heat exchangers The key final adjustment for most oil burners is: - ANSWER- Combustion air All petroleum products are chemical compounds of: - ANSWER- Carbon and hydrogen To ensure clean, uncontaminated fuel reaches the oil burner: - ANSWER- - Install tanks properly
- Regularly inspect them and fix minor defects before they lead to major problems
- Install a quality oil filter Water in oil tanks come from: - ANSWER- - Condensation
- On outside tanks-broken tank gauges, loose or missing fill and vent caps
- Failing to drain water from a tank before installation When installing a tank be sure: - ANSWER- - The fill and vent lines are pitched downwards towards the tank
- To install a vent alarm and a tank gauge
- To install an oil filter and a fusible valve where required Oil lines buried in concrete should be: - ANSWER- Sleeved in plastic or PVC pipe with no fittings below the floor The purpose of fuel units (oil pumps) is: - ANSWER- - Lift oil from the tank to the burner
- Prevent contaminants that passed the external oil filter from clogging the nozzle
- Deliver oil at a constant and regulated pressure to the nozzle True or False: When replacing the nozzle to increase the spray pattern the electrodes must be adjusted - ANSWER- False The fusible link melts at what temperature? - ANSWER- 165 When checking for fuel line leaks: - ANSWER- Vacuum check first True or False: When the thermostat calls for heat, the burner and blower start at the same time? - ANSWER- False Boiler water limit control indicates? - ANSWER- Pressure and Temperature A siphon is used to prevent _________ from entering the control? - ANSWER- Steam The flow of natural chimney draft is caused by? - ANSWER- Negative pressure True or False: Power venters should be installed closest to the exterior wall? - ANSWER- True Unconfined space - ANSWER- Total BTU's Div 1000 x 50
What is the exception to the restriction on compression fittings used on oil lines? - ANSWER- Flair type & gauge able two feral swage type fittings are allowed True or False: Underground tank test wells can be installed in basements - ANSWER- False A controller acting as a safety limit shall be installed in the... - ANSWER- Burner supply circuit in addition to the regular operating control If a gas pilot is used for ignition, the flame must be proven in - ANSWER- 15 seconds What is the "interrupted ignition?" - ANSWER- Ignition is present at the electrodes for a period What would cause a steam boiler to flood? - ANSWER- 1. The water line surges, turning the automatic water feeder on and off
- The water's pH is too high
- The boiler has a tankless coil, and it's leaking
- The boiler is overfired
- The automatic water feeder is positioned too high on the boiler
- Someone is adding water when you're not there
- The piping around the boiler doesn't meet the boiler manufacturer's spec
- Plugged low water cut off
Why are stack relays not used on installs or repairs? - ANSWER- Lock out time 75- sec/not code which is either 15 or out dated What is used to control pressure in a steam system? - ANSWER- Pressuretrol Oil is made of? - ANSWER- Hydro carbons Oil tanks cannot be installed within ____ feet of furnace - ANSWER- 5 What is the most common cause of moisture in the tank? - ANSWER- Condensation What is the advantage of single stage fuel pipe? - ANSWER- - Won't plug filter as fast
- Won't have return line leak
- Won't filter as much oil as 2-pipe system OSV values job is to? - ANSWER- The OSV or oil safety valve controls flow of fuel oil to the oil burner of oil-fired heating boilers, furnaces, and water heaters. This inline oil valve is intended to close automatically and thus stop the flow of oil in the oil line in the event of a fire. Why is it important to keep least 350* stack temperature? - ANSWER- Too low will condensate; condensation in flue pipe and chimney What should be done first when using electronic test equipment? - ANSWER- Smoke test What color is UL wire for ground? - ANSWER- Green
Does a brick/mason chimney need to be lined? - ANSWER- Yes How does PSC work? - ANSWER- Ignitor vs. ignition transformer What does a yellow mark on a combustion on test paper mean? - ANSWER- Unburnt fuel What does a reading of 7% CO in the breech and 10% in the box mean? - ANSWER- Plugged heat exchanger What is the first thing you do with an electric combustion tester? - ANSWER- Take a smoke test not using your electronic equipment If you increase pump pressure you: - ANSWER- Get smaller droplets of oil and increase atomization Tanks may be installed: - ANSWER- - Outside
- Basement
- Inside What happens when you increase pressure in pump? - ANSWER- Smaller droplets; increases atomization How would you replace nozzle? - ANSWER- Manufacturer specs Cloud point: - ANSWER- - Is the temperature at which wax crystals begin to form in the fuel typically 10-
- Degrees above the pour point Pitch towards tank supply - ANSWER- 1/4 inch Inspection of oil burner - ANSWER- Local fire chief or His Designate Where is the fusible link mounted? - ANSWER- Before the filter
- Fireomatic before filter and at burner Why would Power Venter system be sooted up? - ANSWER- - Poor draft
- Proving tube might be plugged Old Iron Core Transformer has what voltage? - ANSWER- 10,000 Voltages 9- How do you remove oil out of a chamber? - ANSWER- Absorbent Low amount of air going through a furnace? - ANSWER- Leaking Plenum Amount of air needed in chamber - ANSWER- 80 square inches of space of nozzle .75-3. When choosing an oil filter what do you look for? - ANSWER- Both micron and flow rate Clear tube on fuel unit checking for? - ANSWER- Both color and air bubbles
- Oil expansion in the nozzle line after shut down When using a pump type smoke tester, ten full strokes are necessary to: - ANSWER- Draw the proper amount of flue gas through the paper A CO2 reading of 7% at the breach. and 10% over the fire indicates: - ANSWER- Excess air leaks into the furnace or boiler Increasing the air input to clean up the fire will also increase: - ANSWER- The flue gas temperature In order to calculate the steady state efficiency we need the following two pieces of information: - ANSWER- The net stack temperature and either the % of CO2 or O The holes that are provided in the flue pipe for combustion testing must be: - ANSWER- As close to the appliance as possible The amount of electricity that flows in a wire is measured in: - ANSWER- Amperes The flow of electricity in a circuit is opposed by: - ANSWER- Resistance If a split phase burner motor does not operate after the primary control has been reset and the voltage to the motor is correct you should check: - ANSWER- The overload switch PSC motors use a capacitor to release an electrical charge that helps get them started. Once they start: - ANSWER- The capacitor and the auxiliary windings remain in circuit while the motor is running
Any dirt or lint build up in the bevel of the burner fan blades will: - ANSWER- Reduce the amount of combustion air The control that shuts off the burner in the event of excessive temperature or pressure is a: - ANSWER- High limit control A reverse acting aquastat is used in a hydronic system to: - ANSWER- Stop the circulator when the boiler water temperature falls below a preset temperature In all oil powered residential heating systems the high limit must be: - ANSWER- Line voltage and wired in series with the primary control. Excessive draft drop through the heat exchanger indicates: - ANSWER- Heavy soot and scale deposits in the heat exchanger When the combustion gases get too cold - ANSWER- The water vapor in the flue gas will condense Power venters use: - ANSWER- A fan to pull the combustion products through the heat exchanger and out of the building The element makes up about 21% of air is: - ANSWER- Nitrogen As more air is added to the fire: - ANSWER- The CO2 reading goes down and the O reading goes up
A CO2 reading of 7% at the breech and 10% over the fire indicates: - ANSWER- Excess air leaks into the furnace of boiler To calculate the combustion efficiency we must know: - ANSWER- The net stack temperature and excess air Off cycle heat loss is created by air flow through the heat exchanger and up the chimney. Which of the following is NOT a factor in off-cycle losses? - ANSWER- The oil pump pressure Flame retention burners have revolutionized our industry. They are more reliable, efficient, and cleaner burning then the older burners. Which of the following is NOT an advantage of flame retention? - ANSWER- It reduces jacket and piping losses What affect does higher viscosity have on nozzle operation? - ANSWER- Increases flow rate The purpose of the oil burner nozzle is to: - ANSWER- Atomize, pattern and meter the oil. The draft regulator must be installed: - ANSWER- Always, except when the equipment is designed to otherwise control the draft. A device that uses electricity to perform useful work is a: - ANSWER- Load An electrical circuit for an oil burner will contain: - ANSWER- - A conductor from the power source to the burner and back to the power source
- Loads In a series circuit there is only one: - ANSWER- Path for current through the loads Oil heating systems should be: - ANSWER- Wired on their own separate circuit The heat anticipator in a thermostat should be set to: - ANSWER- The amperage draw of the control circuit A thermostat with a single pole single throw switch that closes on temperature fall: - ANSWER- Interrupted ignition Energizing the ignition circuit during the entire burn cycle: - ANSWER- Significantly reduces ignition component life Ignitors are better than ignition transformers because: - ANSWER- They have higher output voltage and use less electricity than transformers The switch that opens when a split phase motor has almost reached full speed is a: - ANSWER- Start switch If a split phase burner motor does not operate and does not hum and the voltage to the motor is correct you should check: - ANSWER- The overload swich We use capacitor start motors because: - ANSWER- They provide greater starting torque
