Refrigeration & Air Conditioning Mechanic Red Seal · Question
Which of the following methods is least suitable for accurately measuring airflow in a dirty or particulate-laden exhaust duct?
Hot-wire anemometers rely on the transfer of heat from a heated wire to the moving air. Particulates can quickly foul and damage the delicate hot wire, leading
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Question: Which of the following methods is least suitable for accurately measuring airflow in a dirty or particulate-laden exhaust duct?
Answer options:
- Pitot static tube with cleanout ports ✅ Hot-wire anemometer
- Capture hood (balometer)
- Fan affinity laws calculation
Correct answer: Hot-wire anemometer
Explanation: Hot-wire anemometers rely on the transfer of heat from a heated wire to the moving air. Particulates can quickly foul and damage the delicate hot wire, leading to inaccurate readings and potential irreversible damage to the instrument. Pitot static tubes are more robust in dirty air if regularly cleaned.
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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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