Refrigeration & Air Conditioning Mechanic Red Seal · Question
A refrigeration compressor contactor's main power contacts are severely pitted and discoloured. What is the most significant consequence of operating with contacts in this condition?
Pitted and discoloured contactor contacts indicate surface degradation. This increases the electrical resistance across the contacts, leading to excessive heat
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Question: A refrigeration compressor contactor's main power contacts are severely pitted and discoloured. What is the most significant consequence of operating with contacts in this condition?
Answer options:
- Reduced voltage drop across the contacts.
- Decreased power consumption of the compressor. ✅ Increased resistance, leading to heat generation and potential contact welding.
- Improved magnetic field strength for coil pull-in.
Correct answer: Increased resistance, leading to heat generation and potential contact welding.
Explanation: Pitted and discoloured contactor contacts indicate surface degradation. This increases the electrical resistance across the contacts, leading to excessive heat generation, increased voltage drop, and a higher risk of the contacts welding together, which would cause the compressor to run continuously.
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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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