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Nora Review Questions and Answers | Latest Version | 2025/2026 | Correct & Verified
What is the main purpose of a fuel oil pump in a heating system?✔✔ To deliver oil at the correct pressure for combustion
Why is it important to remove air from an oil burner fuel line?✔✔ To prevent misfires and ensure steady fuel flow
What component ensures the correct air and fuel mixture in an oil burner?✔✔ The air adjustment system
How does a dirty fuel filter affect burner operation?✔✔ It restricts fuel flow and can cause burner shutdown
What should be checked if an oil burner fails to ignite?✔✔ The fuel supply, ignition system, and safety controls
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Why is proper electrode positioning critical in an oil burner?✔✔ To ensure efficient and reliable ignition
What is the function of a cad cell relay in an oil burner system?✔✔ To shut down the burner if no flame is detected
How does an oversized nozzle affect burner performance?✔✔ It can cause incomplete combustion and excessive soot
Why is draft control important in a venting system?✔✔ To regulate airflow for proper combustion
What can happen if there is too much air in the combustion process?✔✔ The flame weakens, and efficiency decreases
What causes delayed ignition in an oil burner?✔✔ Faulty electrodes, low pump pressure, or a weak ignition transformer
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How does a barometric damper improve combustion efficiency?✔✔ By maintaining proper draft levels in the chimney
Why should an oil burner be serviced regularly?✔✔ To ensure safe operation and maintain efficiency
What is the function of a primary control in an oil burner?✔✔ To monitor burner operation and shut it down if a problem occurs
How can you tell if an oil burner is running too rich?✔✔ Excess smoke or soot buildup in the heat exchanger
What should be done before testing combustion efficiency?✔✔ Allow the burner to warm up and reach steady operation
Why is it important to check combustion air supply in a furnace room?✔✔ To ensure the burner gets enough oxygen for proper combustion
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What is a sign of water contamination in a fuel oil tank?✔✔ Rust, sludge, or burner misfires
How does a clogged pump strainer impact burner operation?✔✔ It restricts fuel flow, causing poor atomization and ignition problems
What should be done before replacing a cad cell sensor?✔✔ Turn off power and verify the control system
Why is it necessary to insulate oil lines in cold climates?✔✔ To prevent fuel gelling and flow restrictions
What is the purpose of a delayed oil valve in a burner system?✔✔ To allow air to clear before fuel is introduced for ignition
How does low pump pressure affect an oil burner flame?✔✔ It results in a weak, unstable flame and poor combustion
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