Refrigeration & Air Conditioning Mechanic Red Seal · Question
A three-phase motor runs hot and draws excessive current on one phase. What is a possible cause?
Single phasing causes the remaining phases to carry disproportionately higher current, leading to overheating and potential motor failure.
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Question: A three-phase motor runs hot and draws excessive current on one phase. What is a possible cause?
Answer options: ✅ Single phasing (loss of one phase)
- Low voltage supply
- Overcharge of refrigerant
- Dirty air filter
Correct answer: Single phasing (loss of one phase)
Explanation: Single phasing causes the remaining phases to carry disproportionately higher current, leading to overheating and potential motor failure.
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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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