Type III — Low-PressureCâu 195 / 240
Excessive water in a low-pressure chiller can freeze and rupture tubes because low-pressure refrigerants:
a.Boil at very high temperatures
b.Absorb water readily
c.Evaporate at low temperatures that can chill the water below freezing
d.Contain antifreeze additives
Giải thích
Because low-pressure refrigerants boil at low temperatures under vacuum, they can chill intruding water below its freezing point, and the expanding ice can rupture the chiller tubes. Water intrusion also causes acid and corrosion. This is one more reason to keep the machine tight and free of leaks.
Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- In a low-pressure chiller, the evaporator normally operates:
- A technician recovering R-123 reaches 25 mm Hg absolute but the reading rises back up after the recovery machine stops. This usually indicates:
- Which of the following is NOT a low-pressure appliance refrigerant?
- When handling a large recovery cylinder of R-11 removed from a chiller, the technician must remember to:
- A high-efficiency purge unit on a chiller is often equipped with a purge-rate log because a rising rate:
- The deep 25 mm Hg absolute recovery requirement exists for low-pressure appliances because:
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