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HVAC OIL BURNER EXAM | QUESTIONS &
ANSWERS (VERIFIED) | LATEST UPDATE |
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An up flow furnace Correct answer: Has the return air at the bottom Of the six regular grades of fuel oil,The grade most commonly used in residential and light commercial heating systems is No. Correct answer: 2 How much heat is produced when 2 gallons of No. 2 fuel oil is burned? Correct answer: 280, What could be the cause of a high steak temperature Correct answer: Too much air How would you prove a furnace was stopped up with soot in the heat exchanger Correct answer: Draft gauge at the inspection door What is the function of a heat exchanger
Correct answer: To exchange the heat from the combustion What is the function of the combustion chamber Correct answer: Place to burn the fuel What is the purpose of the restrictor in the blast tube Correct answer: To create air Velocity What is the difference between a hollow core and a solid core oil nozzle Correct answer: Oil pattern What is the purpose of the tangential Slots in the nozzle Correct answer: Push the oil in a swirling motion What must be done to oil to prepare it to burn Correct answer: Atomization What would be the result of a solution where a customer reset the primary control many times before the service person arrived Correct answer: too much oil in the combustion chamber, Irrupt What are the symptoms of an oil forced air furnace with a hole in the heat exchanger Correct answer: Soot in the register and odors
The fuel oil enters a orifice of the novel through the Correct answer: Swirl chamber The circular direction of the air in the air tube is in blank direction as the fuel oil motion Correct answer: The opposite The ignition transformer steps up the 120 V residential voltage to approximately blank V. Correct answer: 10, The stack switch or relay Correct answer: Has hot contacts that close when the temperature of the fuel pipe rises A cad cell is a safety device that Correct answer: Senses light in the combustion chamber A booster pump is often needed when the oil supply tank is blank below the oil burner Correct answer: 15 ft An oil deaerator
Correct answer: Allows a one pipe oil delivery system to operate as a two pipe oil delivery system A fuel line filter is located between the Correct answer: Supply tank and the pump The heat exchanger in a forced air oil fired furnace Correct answer: B- Transfers heat from the flue gases to the air to be heated and circulated and keep them separate The condensing oil furnace achieves part of it higher efficiency because of a blank exchange Correct answer: B- Latent heat Access air is supplied at the burner to ensure that there will be Correct answer: B- Enough oxygen for complete combustion How much access air is typically supply to the system to ensure that complete combustion occurs Correct answer: 50% To perform combustion efficiency test a whole must be made Correct answer: B- In the flue on the furnace side of the draft regulator
Insulated with ceramic material to prevent electrical ground Correct answer: Electrodes 8 gallons of oil how many BTUs would you have Correct answer: 1,020, What color is #2 fuel oil Correct answer: Red What material is in a cad cell that allows it to respond to light Correct answer: Camum sulfide What is the response that a cad cell makes to change in light Correct answer: Produces more resistance less light, less resistance more light What would the symptoms be of a dirty cad cell Correct answer: Burner wouldn't start What would the result of access oil in the combustion chamber be if it were ignited Correct answer: Overfiring What would the symptoms of an open cad cell be Correct answer: Burner would not start
What would cause a cad cell to become dirty Correct answer: Soot What is the pressure at which oil burner nozzles are rated Correct answer: 100 psi Why should fuel oil not be spilled Correct answer: Odor and could start a fire What was the size of the pressure tap in the oil pump for the high-pressure gauge Correct answer: 1/4, 1/8 depending on the unit What was the size of the pressure tap in an oil pump for the low pressure gauge Correct answer: Same as three, 1/4 or 1/ On average, how many BTUs are there in a gallon of fuel oil Correct answer: 140, What is the typical Efficiency conventual oil fired furnace Correct answer: 80% When is a two pipe oil delivery system recommended for an oil burner
What is the typical voltage for an oil fired furnace Correct answer: 115 What is the typical control voltage for an oil fired furnace Correct answer: 24 volts What is the function of the limit control for an oil fired furnace Correct answer: Shut off burner from overheating What is the function of the stack switch on and oil fired furnace Correct answer: Makes sure combustion is taking place What is the function of a cad cell on an oil fired furnace Correct answer: Senses light from the flame Why should you be sure that no oil is left on any part, in addition to its being a possible fire hazard Correct answer: Odor What color of No.2 Fuel oil? Why is it this color Correct answer: Red and taxes What must be done to oil to prepare it to burn
Correct answer: Atomizations Why is the typical oil burner called a "gun type" oil burner Correct answer: Oil is pressurized and forced into a combustion chamber What is the typical pressure at which in oil burner operates Correct answer: 100 psi Is there a strainer in an oil burner nozzle Correct answer: Yes What is the purpose of the tangential slots in an oil burner nozzle Correct answer: Atomize oil, swirl oil, better air oil contact What would happen if too much oil were allowed to enter the combustion chamber and Ignition occurred Correct answer: Burn out of control What should you do in the event you ignited a furnace with too much oil in the combustion chamber Correct answer: Reduce the airflow How long is a furnace allowed to run without ignition
