Unit 32 - Oil Heat Exam Questions and Answers (RATED +)

The grade of fuel used in residential and light commercial units is ____. - ANSWER-number 2 When the oil tank is above the oil burner pump, the fuel oil supply system would normally be a _____. - ANSWER-gravity flow, one pipe system An auxiliary tank and booster pump system is required if the oil supply is ____ below the oil burner pump. - ANSWER-15 feet or more If a technician inspects the interior of a combustion chamber and finds large quantities of unburned oil, he would correctly conclude that ____. - ANSWER-stack switch or cad cell may be defective and primary control unit may be defective. When nozzles problems are apparent, the nozzle should be removed using ____ and replaced - ANSWER-a special nozzle wrench The cad cell relay is a safety device that uses which of the following to prove ignition? - ANSWER-light in the combustion chamber The stack switch or stack relay _____. - ANSWER-shuts down the burner if it does not sense heat in the stack A condensing oil furnace operates at a higher efficiency because part of the heat output is ____. - ANSWER-latent heat