Massachusetts Oil Burner License Exam - Questions and Answers Which substance offers the most resistance to the flow of electricity? Carbon What must be
... [Show More] done to a draft gauge before use? Zero out the scale Which of the following is considered the better chimney? Cement block with a tile liner Air is composed of oxygen and nitrogen in what percentages? 21 and 79 Before installing a new nozzle the service technician should: Flush out the nozzle line and adapter Pulsating oil pump pressure is caused by: -Air leaks in the suction line -Partly clogged fuel strainer -Worn gear set Flash point of a fuel is an indication of: The lowest temperature that a fuel will flash but not burn continuously Corrosion to the flue pipe may occur if: The fuel gas temperature is below the dew point temperature Inadequate air supply can be cause by: Not enough air in the furnace room Increasing the air input to gain a cleaner fire will also increase the: Flue gas temperature A single stationary conductor in the flux of a permanent magnet will: -NOT induce a current flow in the conductor -NOT reverse the current flow in the conductor -NOT increase the amperage in the conductor When installing a power vent system: Follow the manufacturer's installation guide To test a stack mounted primary control safety, you should: Remove the unit from the flue pipe An advantage of power venting is: -Installing an oil fired unit where there is no chimney -More positive control of draft -Lower cost of new homes What is the approximate safety timing of stack mounted primary controls? 60 to 90 days The best way to adjust an oil burner is: With combustion test equipment What is the correct procedure for performing a combustion efficiency test? -Draft -Smoke -CO2 The temperature of fuel oil can affect: -Flow rate -Droplet size -Soot formation Which of the following does not affect draft? Boiler design What does AFUE stand for? Annual Fuel Utilization Efficiency Which substance will cause the formation of sediment at the bottom of a fuel storage tank? Water The function of the barometric draft regulator is to: Mix room air with combustion gasses in the chimney The droplet size of atomized fuel oil as pump pressure increases: Decreases Which of those listed below are acceptable CO2 readings for new modern equipment? 10 1/2% to 12 1/2% What are the two things that must be mixed to have proper combustion? -Fuel oil vapor -Combustion air What two major components make up fuel oil? Hydrogen and carbon Increasing fuel pump pressure will _______ flow rate through the nozzle. Increase Incomplete combustion causes? -Soot and smoke -Poor efficiency -Low CO2 One advantage to light weight combustion chambers is they: Cool down quickly Flame retention oil burners do not depend as much on _______ for good combustion as did older burners. Air Breaking up oil into small droplets is called: Atomization Excess air in the combustion process lowers system efficiency by: Raising flue gas temperatures Two properties of light weight combustion chambers are: Rapid heat up and rapid cool down What are three types of heat transfer? radiation, conduction, convection When a boiler or furnace is oversized, off cycle heat loss ______ and efficiency decreases. Increase Which are advantages that new and properly adjusted oil fired boilers and furnaces offer over older units: -Economical operation -Improved reliability -Cleaner operation What is the temperature range of combustion with a new burner and boiler or furnace combination? 2500° to 3200°F The annual fuel utilization efficiency (AFUE) is: A test performed to rate boilers and furnaces. What steps should you follow when replacing a boiler or furnace to assure high efficiency? [Show Less]