Refrigeration & Air Conditioning Mechanic Red Seal · Question
When brazing copper tubing, what is the primary purpose of purging with nitrogen?
Purging with nitrogen displaces oxygen inside the copper tubing. This prevents the formation of copper oxides (scaling) on the internal surfaces, which can brea
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Question: When brazing copper tubing, what is the primary purpose of purging with nitrogen?
Answer options:
- To cool the tubing rapidly after brazing ✅ To prevent oxidation (scaling) on the inside of the tubing
- To increase the strength of the braze joint
- To detect leaks during the brazing process
Correct answer: To prevent oxidation (scaling) on the inside of the tubing
Explanation: Purging with nitrogen displaces oxygen inside the copper tubing. This prevents the formation of copper oxides (scaling) on the internal surfaces, which can break off and damage system components.
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- 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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