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NORA Final Review Questions and Answers | Latest Version | 2025/2026 | Correct & Verified
What should be done after replacing an oil burner nozzle?✔✔ Adjust air settings and check for proper combustion
Why should water never be allowed to accumulate in an oil tank?✔✔ It can cause sludge buildup and burner malfunction
What is one sign of excessive draft in a venting system?✔✔ A roaring flame or reduced heat transfer efficiency
How does a fuel unit maintain constant oil pressure?✔✔ It regulates and delivers oil at a set pressure to the burner
Why is a delayed oil valve used in some burners?✔✔ To allow air to clear before fuel is introduced, preventing puff-back 1 / 3
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What happens if an oil burner is over-fired?✔✔ It can cause overheating, inefficient combustion, and system damage
How can you test a cad cell for proper operation?✔✔ Measure its resistance in light and dark conditions
What is one possible cause of excessive smoke from an oil burner?✔✔ Too much fuel or not enough combustion air
How does an oil burner ignition system create a spark?✔✔ By using high-voltage electricity to jump a gap between electrodes
Why should an oil heating system have proper air circulation?✔✔ To ensure complete combustion and prevent carbon monoxide buildup
What should be done before restarting a burner after a lockout?✔✔ Diagnose and fix the problem before resetting the control 2 / 3
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What effect does high oil viscosity have on burner performance?✔✔ It can cause poor atomization and inefficient combustion
How does an oil preheater benefit burner operation in cold climates?✔✔ It improves fuel atomization and combustion efficiency
What is the purpose of a heat exchanger in an oil heating system?✔✔ To transfer heat from combustion gases to air or water
What is the main purpose of a combustion chamber in an oil burner?✔✔ To provide a controlled space for fuel combustion
Why should the oil supply line be free of air?✔✔ Air in the line can cause burner shutdown or erratic operation
What is the role of a primary control in an oil heating system?✔✔ It monitors burner operation and shuts it down if a malfunction occurs
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