Type III — Low-PressureCâu 170 / 240
A low-pressure refrigerant is defined as one with a boiling point at atmospheric pressure that is:
a.Below minus 50°F
b.Above about 50°F
c.Exactly 32°F
d.Between minus 50°F and 10°F
Giải thích
Low-pressure refrigerants boil above roughly 50°F at atmospheric pressure, so the appliance operates at or below atmospheric pressure. Refrigerants boiling between minus 50°F and 10°F are high-pressure, and those below minus 50°F are very-high-pressure. This boiling-point distinction sets which certification type applies.
Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Water entering the refrigerant side of a low-pressure chiller through a leaking tube is dangerous mainly because it can:
- To speed up refrigerant recovery from a low-pressure chiller, a technician should:
- Frequent operation of the purge unit on a low-pressure chiller is usually a sign that:
- Which gas is safe to use, along with a trace of refrigerant, to raise pressure in a low-pressure appliance for leak detection?
- The 25 mm Hg absolute recovery requirement for low-pressure appliances applies to:
- Approximately what inches-of-mercury vacuum reading corresponds to the 25 mm Hg absolute recovery level for low-pressure appliances?
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