NATE/ICE, Top Exam Questions &
Answers. Graded A+
What measurements are needed to determine oil furnace combustion efficiency? - ✔✔-Net stack
temperature and CO2 concentration
After installation and 20 minutes of run time, an oil furnace is found to have a CO2 of 8%. What could
cause the low CO2 reading? - ✔✔-Excess primary air
What is the main safety precaution the technician must take before attempting to fire the oil furnace on
a "no heat" service call for an oil-fired furnace? - ✔✔-Check the combustion chamber for liquid oil
Temperature rise through an oil heating furnace is calculated by the formula: - ✔✔-temperature of the
indoor supply air minus temperature of the return air
The primary reason for using a barometric draft control on an oil furnace is to maintain - ✔✔-consistent
draft
A customer is upset because the oil burner is causing high fuel bills. The technician finds the stack
temperature to be very high, the CO2 level at 8% and no smoke present. What action should be taken to
resolve this? - ✔✔-Reduce primary air
How is atomized oil in an oil gun burner ignited? - ✔✔-By electric arc between electrodes
What is the best procedure for checking the operation of the cad cell? - ✔✔-Disconnect one cad cell
lead from the primary
How many gallons of oil will be used each hour if the firing rate is 0.85 gallons per hour (gph) on an oil
nozzle and the applied pressure is 100 psi? - ✔✔-0.85 gph
Answers. Graded A+
What measurements are needed to determine oil furnace combustion efficiency? - ✔✔-Net stack
temperature and CO2 concentration
After installation and 20 minutes of run time, an oil furnace is found to have a CO2 of 8%. What could
cause the low CO2 reading? - ✔✔-Excess primary air
What is the main safety precaution the technician must take before attempting to fire the oil furnace on
a "no heat" service call for an oil-fired furnace? - ✔✔-Check the combustion chamber for liquid oil
Temperature rise through an oil heating furnace is calculated by the formula: - ✔✔-temperature of the
indoor supply air minus temperature of the return air
The primary reason for using a barometric draft control on an oil furnace is to maintain - ✔✔-consistent
draft
A customer is upset because the oil burner is causing high fuel bills. The technician finds the stack
temperature to be very high, the CO2 level at 8% and no smoke present. What action should be taken to
resolve this? - ✔✔-Reduce primary air
How is atomized oil in an oil gun burner ignited? - ✔✔-By electric arc between electrodes
What is the best procedure for checking the operation of the cad cell? - ✔✔-Disconnect one cad cell
lead from the primary
How many gallons of oil will be used each hour if the firing rate is 0.85 gallons per hour (gph) on an oil
nozzle and the applied pressure is 100 psi? - ✔✔-0.85 gph
