Refrigeration & Air Conditioning Mechanic Red Seal · Question
A refrigeration system utilizing a fixed orifice (capillary tube) expansion device is exhibiting a 'starved' evaporator and very low suction pressure. Which of the following is the most probable cause?
When moisture is present in the system, it can freeze at the point of pressure drop in the capillary tube, effectively blocking refrigerant flow. This leads to
Start free practice for Refrigeration & Air Conditioning Mechanic Red Seal
500 questions · no signup required · 40 free questions per day
Question: A refrigeration system utilizing a fixed orifice (capillary tube) expansion device is exhibiting a 'starved' evaporator and very low suction pressure. Which of the following is the most probable cause?
Answer options:
- Overcharged refrigerant system
- Dirty condenser coil
- Insufficient airflow over the evaporator coil ✅ Moisture freezing in the capillary tube
Correct answer: Moisture freezing in the capillary tube
Explanation: When moisture is present in the system, it can freeze at the point of pressure drop in the capillary tube, effectively blocking refrigerant flow. This leads to a starved evaporator and very low suction pressure, often intermittent as the ice thaws and refreezes.
Start free practice for Refrigeration & Air Conditioning Mechanic Red Seal
500 questions · no signup required · 40 free questions per day
More about Refrigeration & Air Conditioning Mechanic Red Seal
Related Questions
- 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
- Which type of electric motor requires a capacitor for starting and running, offering higher efficiency and bet
- When evacuating a refrigeration system, what is the recommended deep vacuum level, typically measured in micro
More for Refrigeration & Air Conditioning Mechanic Red Seal candidates
FAQs
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
Ready to practice?
Free, no signup required. Build a wrong-question list as you go.
Start Free Refrigeration & Air Conditioning Mechanic Red Seal Practice →Related courses
Other Canadian certifications candidates often prepare for alongside this one.