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Newest Oil Burner License Exam 2025 | Updated
Questions and Correct Answers | Graded A+ |
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By replacing an old style burner with a new retention head burner, off-cycle losses are reduced because: ---------CORRECT ANSWER-----------------It restricts the draft induced airflow through the burner. A simple, effective, yet inexpensive way to increase on-cycle system efficiency is to: ---------CORRECT ANSWER-----------------Match the nozzle to the heating load The ______ are important for both on and off cycle efficiency in a fire tube boiler. ---------CORRECT ANSWER-----------------Combustion chambers Before lowering the temperature of a hot water boiler, consideration must be given to the: ---------CORRECT ANSWER-----------------Design of the heating system The boiler or furnace is not the only source of heat loss. The heating system can lose heat through: ---------CORRECT ANSWER------------------Uninsulated steam pipe
- Uninsulated hot water pipe
- Uninsulated warm air ducts
A condition often overlooked on a call involving odors is: ---------CORRECT ANSWER-----------------Insufficient air in the boiler room One method of removing oil and dirt from a newly installed steam boiler is to: ----- ----CORRECT ANSWER-----------------Skim the boiler through a nipple at the water level after a few days If a cad cell is "seeing" light when the thermostat is connected to the T-T terminals calls for heat: ---------CORRECT ANSWER-----------------The primary control will not energize A reverse acting aquastat is used in a hydronic system to: ---------CORRECT ANSWER-----------------Stop the circulator when the water temperature falls below a preset temperature Burner air fans are manufactured to very close tolerances because an unbalanced fan can: ---------CORRECT ANSWER------------------Put a strain on motor bearings
What are three types of heat transfer ---------CORRECT ANSWER----------------- radiation, conduction, convection When a boiler or furnace is oversized, off cycle heat loss ______ and efficiency decreases. ---------CORRECT ANSWER-----------------Increase Which are advantages that new and properly adjusted oil fired boilers and furnaces offer over older units: ---------CORRECT ANSWER------------------Economical operation
- Improved reliability
- Cleaner operation What is the temperature range of combustion with a new burner and boiler or furnace combination? ---------CORRECT ANSWER-----------------2500° to 3200°F The annual fuel utilization efficiency (AFUE) is: ---------CORRECT ANSWER------------- ----A test performed to rate boilers and furnaces.
What steps should you follow when replacing a boiler or furnace to assure high efficiency? ---------CORRECT ANSWER------------------Use AFUE ratings to select a high efficiency model
- Size the boiler or furnace properly
- Look at other heating system factors and minimize losses Which of those listed below include heat losses from on cycle, off cycle, jacket distribution and infiltration? ---------CORRECT ANSWER-----------------AFUE The AFUE for oil fired boilers range from _____ to _____ percent ---------CORRECT ANSWER-----------------76 to 88 Which of the following is a design feature of a low mass boiler? ---------CORRECT ANSWER-----------------High heat transfer Which of the following is the only efficiency test that can be done in the field? ----- ----CORRECT ANSWER-----------------Combustion efficiency Which of the following is a type of draft? ---------CORRECT ANSWER------------------ Natural
- Forced
A common source of air leakage into the chimney is: ---------CORRECT ANSWER----- ------------Loose fitting clean out door at base of chimney What is the minimum NET temperature needed at the breaching of an oil fired appliance to prevent condensation problems? ---------CORRECT ANSWER------------- ----385° The main parts of the chimney venting system used in oil heated houses are: ------ ---CORRECT ANSWER------------------Chimney
- Flue gas collector
- Draft control (barometric damper) What is the first thing a tech should do when arriving at a no combustion call? ----- ----CORRECT ANSWER-----------------Ask how many times the customer reset the unit. What is the best long term solution for preventing a clogged nozzle? --------- CORRECT ANSWER------------------Remove any underground storage tanks.
- Install a quality oil filter.
- Cut the suction line 10" above the tank outlet to prevent sludge.
Hot water and steam valves are interchangeable. ---------CORRECT ANSWER--------- --------False When in the presence of a flame, a cad cell normally reads.. ---------CORRECT ANSWER----------------- 300 - 1000 ohms If a pump is used to bring oil to a level higher than the tank, an oil safety valve is required. ---------CORRECT ANSWER-----------------True On a call where a hydronic heat system is putting out too much heat on the stack, the issue may be.. ---------CORRECT ANSWER------------------Too much draft.
- Not enough combustion air in the equipment room.
- Air leakage into chamber. A high CO2 reading is caused by.. ---------CORRECT ANSWER----------------- Incomplete combustion An often overlooked cause of a high CO2 reading is.. ---------CORRECT ANSWER----- ------------Not enough combustion air in the equipment room.
What is a power venter and what does it do? ---------CORRECT ANSWER-------------- ---An electrical device that sends fluid gases into the chimney connector. A burner in a confined space using 1 GPH of #2 fuel oil requires what size permanent opening for combustion air? ---------CORRECT ANSWER----------------- 140" The difference between an adjustable flame retention burner and a fixed flame retention burner is? ---------CORRECT ANSWER-----------------Air inlets can be adjusted Ignitor position can be adjusted Fuel can be adjusted Oil tank design, construction, installation and testing shall be in accordance with.. ---------CORRECT ANSWER-----------------527 CMR 9. Heat is a form of.. ---------CORRECT ANSWER-----------------Energy
If a burner is operational but the circulator pump isn't running.. ---------CORRECT ANSWER-----------------The pump relay is not working correctly A method of dealing with low viscosity/cold temps with #2 oil? ---------CORRECT ANSWER-----------------Increase pump pressure/ decrease nozzle size What is needed at the outlet of an oil tank? ---------CORRECT ANSWER----------------
- Thermal safety valve Where do you obtain an installation permit for oil burners? ---------CORRECT ANSWER-----------------Fire Dept How many Btu's approximately in 1 gal of #2 fuel oil? ---------CORRECT ANSWER---- -------------140,000 btu's Solid state ignition is superior to spark because ---------CORRECT ANSWER------------ -----It is not affected by reduced voltage What is an installation? ---------CORRECT ANSWER-----------------The complete setting in place, ready for operation, of an oil burner appliance together with its accessories and equipment.
What travels on the inside of the wire? ---------CORRECT ANSWER----------------- Volts What does readily accessible mean pertaining to oil burning equipment? --------- CORRECT ANSWER-----------------Capable of being reached easily and quickly for operation, maintenance or inspection. What is the minimum vent pipe on an oil tank? ---------CORRECT ANSWER------------ -----1 1/4" What causes corrosion on a flue pipe? ---------CORRECT ANSWER----------------- When the flue pipe is operating below the dew point temperature. What are the methods to prevent oil waxing? ---------CORRECT ANSWER-------------- ---Put additives in the fuel. Add an oil line heater. Cut with #1 fuel or kerosene.
What is the maximum tank size allowed inside unenclosed? ---------CORRECT ANSWER-----------------660 gal What is the purpose of a delayed oil valve? ---------CORRECT ANSWER----------------- Allows time for the oil pump to get up to speed. Delays oil flow to the nozzle. On a call where a hydronic heat system is putting out too much heat, the issue could be? ---------CORRECT ANSWER-----------------A shorted out thermostat. When measuring a cad cell with the burner running and the ff terminals jumped out, what should the cad cell reading be? ---------CORRECT ANSWER----------------- 1600 ohms What are the possible causes of soot at or near the power venter? --------- CORRECT ANSWER-----------------Incomplete combustion What is a possible side effect of air in a nozzle line? ---------CORRECT ANSWER------ -----------Soot
One gallon of #2 fuel oil contains approximately: ---------CORRECT ANSWER---------- -------140,000 BTU's Pour point problems with outside above ground fuel tanks can be partially relived by: ---------CORRECT ANSWER------------------Relocating the outside fuel filters and strainers to the inside
- Switching to #1 fuel oil
- Reducing the pour point of #2 fuel oil by blending it with #1 fuel oil A fuel oil storage tank cannot be installed: ---------CORRECT ANSWER----------------- In the furnace room within 5 feet of the heating unit The primary purpose of a fuel pump in a high pressure burner is to: --------- CORRECT ANSWER------------------Deliver oil at a constant and regulated pressure to the nozzle
- Move oil from the tank to the pump
- Provide a screen to filter the oil If the vacuum reading is substantially above the calculated reading, (with the burner running) the cause may be: ---------CORRECT ANSWER------------------Plugged fuel filter
- Kinked oil supply line
- Check valve sticking
With most new flame retention burners, the motor speed is: ---------CORRECT ANSWER-----------------3400 rpm To check for a proper nozzle line cut-off, the pressure gauge is installed in the: ---- -----CORRECT ANSWER-----------------Nozzle port Fuel units are generally set at the factory at: ---------CORRECT ANSWER--------------- --100 psi The oil burner nozzle in a high pressure burner performs the following functions: - --------CORRECT ANSWER------------------Atomizes the oil
- Provides a pattern of oil spray
- Delivers a fixed amount of oil The nozzle flow rate, spray angle and pattern are directly related to: --------- CORRECT ANSWER------------------Tangential slots
- Swirl chamber
- Orifice
The most common type of burner design today is the: ---------CORRECT ANSWER--- --------------High pressure atomizing Poor draft due to a faulty chimney may be improved by installing a good: --------- CORRECT ANSWER-----------------Draft inducer The draft differential produced by chimneys is best measured with a draft gauge in: ---------CORRECT ANSWER-----------------Inches of water column The most important draft measurement to be taken on any oil-fired unit is: --------
- CORRECT ANSWER------------------The draft at the breach
- The draft over the fire The proper location to install a draft inducer is: ---------CORRECT ANSWER------------ -----In the flue pipe between the draft regulator and the chimney Using combustion test instruments to measure the composition and temperature of the flue gas as they leave the heating unit will indicate the: ---------CORRECT ANSWER-----------------Steady state efficiency
The holes that are provided in the flue pipe for combustion testing must be: ------- --CORRECT ANSWER-----------------Between the heating unit and the draft regulator When using a pump type smoke tester, 10 full strokes are necessary to: --------- CORRECT ANSWER-----------------Draw the proper amount of fluegas past the paper The fluid in a CO2 tester is good for how many tests? ---------CORRECT ANSWER---- -------------For about 200 tests In an electric circuit in order for the wattage to remain the same if the voltage drops, the amperage must: ---------CORRECT ANSWER-----------------Increase When applying current through a conductor that is wound in a coil the magnetic lines of force created are used in ---------CORRECT ANSWER------------------Solenoid valve
- Relay
- Electric motor If in an average 15 amp residential heating circuit, the fuse occasionally blows, you should: ---------CORRECT ANSWER-----------------Use an amp meter to check out the system
