Refrigeration & Air Conditioning Mechanic Red Seal · Question
Brazing copper with nitrogen purge prevents:
Nitrogen avoids cupric oxide formation.
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Question: Brazing copper with nitrogen purge prevents:
Answer options: ✅ Internal oxide scaling
- Sweat joints
- Leaks only
- Color change
Correct answer: Internal oxide scaling
Explanation: Nitrogen avoids cupric oxide formation.
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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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