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NORA Study Guide Questions and Answers | Latest Version | 2025/2026 | Correct & Verified
What is the primary function of an oil burner nozzle?✔✔ To atomize fuel for efficient combustion
Why must an oil burner be properly grounded?✔✔ To ensure electrical safety and proper system operation
What should be done if an oil burner produces excessive soot?✔✔ Check air-to-fuel ratio and clean burner components
How does a flame retention burner improve efficiency?✔✔ By stabilizing and shaping the flame for complete combustion
Why is it important to remove air from an oil heating system?✔✔ Air pockets can cause burner lockout and improper fuel delivery
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What can cause oil burner electrodes to wear out quickly?✔✔ Excessive voltage, misalignment, or poor fuel quality
How can a partially blocked fuel line affect burner operation?✔✔ It can reduce oil flow and cause intermittent shutdowns
Why should a combustion test be performed after adjusting an oil burner?✔✔ To verify proper fuel combustion and efficiency
What happens if an oil burner’s air settings are too high?✔✔ The flame becomes weak, and heat output decreases
How does a stack relay function in an older oil burner system?✔✔ It detects heat from combustion gases to control burner operation
What should be done if a burner motor hums but does not start?✔✔ Check the capacitor, wiring, and motor for faults
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Why must oil storage tanks be vented properly?✔✔ To prevent vacuum formation and allow safe fuel delivery
What can cause an oil burner to drip fuel after shutdown?✔✔ A leaking pump seal or faulty nozzle
How does a delayed ignition affect system safety?✔✔ It can cause fuel buildup and potential combustion explosions
Why should a flue pipe be checked for leaks?✔✔ To prevent carbon monoxide from entering living spaces
What is the purpose of a check valve in an oil heating system?✔✔ To prevent fuel from flowing back into the tank
How does an aquastat maintain boiler temperature?✔✔ By controlling when the burner cycles on and off
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