Refrigeration & Air Conditioning Mechanic Red Seal · Question
When brazing refrigeration tubing, what gas is typically purged through the system to prevent oxidation (scaling) inside the pipes?
Nitrogen is an inert gas that displaces oxygen during brazing, preventing the formation of copper oxides (scale) inside the tubing.
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Question: When brazing refrigeration tubing, what gas is typically purged through the system to prevent oxidation (scaling) inside the pipes?
Answer options: ✅ Nitrogen
- Oxygen
- Acetylene
- Propane
Correct answer: Nitrogen
Explanation: Nitrogen is an inert gas that displaces oxygen during brazing, preventing the formation of copper oxides (scale) inside the tubing.
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Question explanations
- Which of the following refrigerants is a hydrofluorocarbon (HFC) and has a high ozone depletion potential (ODP
- Which component is responsible for compressing the refrigerant vapour to a high pressure and temperature?
- According to the Canadian Electrical Code (CEC), what is the minimum required working clearance in front of el
- What is the main operating characteristic difference between a fixed orifice (capillary tube) and a Thermostat
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