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This document is the "Newest Oil Burner License Exam 2025" guide, offering the most updated questions and answers for those preparing for the oil burner license exam. It is designed to help students and professionals in the HVAC industry understand crucial concepts and best practices for oil burner systems. The guide covers a range of topics, including system efficiency, combustion processes, and the correct installation and testing of oil tanks following regulations such as 527 CMR 9.0. Key topics addressed in this resource include the benefits of upgrading to a newer retention head burner, which reduces off-cycle losses by restricting draft-induced airflow. It also emphasizes matching the nozzle to the heating load as a cost-effective method to enhance system efficiency. The document details the importance of combustion chambers for both on-cycle and off-cycle efficiency in fire tube boilers and discusses considerations for lowering the temperature of hot water boilers.
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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
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
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
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
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.
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----------------
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
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
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: --------
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