HVAC Residential Oil Burners Chpt. 1-8 Exam Questions and Answers(SCORED A+)

wax crystals form, gels up and the viscosity of the oil goes up - ANSWER-What happens to fuel oil when it is stored outside on a day when the temp. is only 12 degrees F? 85% carbon, 15% nitrogen, (ASTM D-396) - ANSWER-What is the chemical composition of fuel oil? If flames hit chamber it will cause soot and carbon, blocks up the heat exchanger passage - ANSWER-What does impingement mean and why is it a problem? 1 quarter inch - ANSWER-How far is the burner blast tube set back in a combustion chamber? 1. fuel delivery system (oil pump) 2. air delivery system (burner motor & motor wheel) 3. ignition - ANSWER-Identify the three systems that must be built into every oil burner 21% oxygen, 79% nitrogen - ANSWER-What is the percentage of oxygen in the air we breathe and what makes up the rest? 140 sq inch per gallon an hour used - ANSWER-What does total free air mean? (TFA) Lets the oil driver know he's filling up the tank and assures it isn't leaking. - ANSWER-What is a vent alarm? Why should it be used on every oil storage tank installation? return line - 6" supply line - 3" - ANSWER-On a two pipe system how far do the supply and return lines need to be off the bottom of the tank? valve that is heat sensitive safety valve, installed at the burner or oil tank - ANSWER-What is a Fire-O-Matic valve? where is it installed? duplex fitting - ANSWER-What type of bushing is used on top of an oil tank for a suction and return oil line bypass plug - ANSWER-What must be installed in an oil pump when it is being used as a two pipe system