Heating & A/C (A7)Câu 85 / 120
The expansion valve or orifice tube controls:
a.Compressor speed
b.Blower motor voltage
c.The flow of refrigerant into the evaporator, causing a pressure drop
d.Cabin air recirculation
Giải thích
The metering device drops the refrigerant pressure and controls flow into the evaporator, allowing it to boil and absorb heat. A restricted orifice or stuck valve causes poor cooling and abnormal pressures. It separates the high side from the low side of the system.
Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- The component that changes high-pressure refrigerant vapor into a liquid by removing heat is the:
- The evaporator in the passenger compartment:
- Technician A says overcharging an A/C system improves cooling. Technician B says overcharging raises system pressures and can reduce cooling and damage the compressor. Who is correct?
- The desiccant in a receiver-drier or accumulator is used to:
- Technician A says a low refrigerant charge typically shows low readings on both gauges with poor cooling. Technician B says the leak should be repaired before recharging to the correct weight. Who is correct?
- Technician A says cabin heat comes from engine coolant flowing through the heater core. Technician B says a leaking heater core can fog the windshield and leave a sweet smell. Who is correct?
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Đội Ngũ Biên Tập PrepPass · Đối chiếu với ASE Automobile Certification Series (A1–A8) · Quy trình kiểm tra