UNIT 55 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX
55-1) List the grades of fuel oil and give a brief description of each type.
a. No 1 – kerosene, 100% light distillates, pours like water, clear, lowest
55-2) What is the difference between a distillate oil and a residual oil?
55-3) How are nozzles rated?
55-4) What does oil viscosity mean?
55-5) Which grade of fuel oil has the highest viscosity?
55-6) Why can oil furnaces operate at efficiencies between 80% and 90% without
condensing water in the heat exchanger or vent?
55-7) List the available warm air oil fired furnace configurations.
55-8) Compare the efficiency of a mid-efficiency oil furnace to an older traditional oil
furnace.
55-9) What is the advantage of a high pressure oil burner?
55-10) What are some of the challenges in building a condensing oil fired furnace?
55-11) How is an oil furnace heat exchanger shaped?
55-12) What is the purpose of the refractory?
55-13) What is the typical output pressure of an oil fired furnace oil pump?
55-14) What are the typical pressure settings for a pressure-reducing valve and system
relief valve in a hot-water oil-fired boiler?
55-15) What is the purpose of an aquastat?
55-16) What is the difference between a direct acting and a reverse acting aquastat?
55-17) What voltage does the ignition transformer provide to the electrodes?
55-18) How does a cad cell sense the flames?
55-19) What does the primary control do?
55-20) What is the heating value of grade 2 fuel oil?