Type III — Low-Pressure第 173 / 240 题
Approximately what inches-of-mercury vacuum reading corresponds to the 25 mm Hg absolute recovery level for low-pressure appliances?
a.About 29 inches Hg vacuum
b.About 15 inches Hg vacuum
c.About 10 inches Hg vacuum
d.About 4 inches Hg vacuum
解析
25 mm Hg absolute is a deep vacuum equal to roughly 29 inches of mercury vacuum on a compound gauge, since atmospheric pressure is about 760 mm Hg or 30 inches Hg. This is far deeper than the 4 to 15 inches used for high-pressure systems. It reflects how completely a low-pressure chiller must be evacuated.
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同考点相关题目
- A low-pressure refrigerant is defined as one with a boiling point at atmospheric pressure that is:
- 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:
- Non-condensable gases such as air that collect in a low-pressure chiller will:
- Compared with older designs, a high-efficiency purge unit is desirable because it:
- A technician wants to warm the refrigerant in a low-pressure chiller to speed recovery. Which method is acceptable?