Core (Universal)第 27 / 240 题
A recovery cylinder is being filled with recovered R-404A. To leave room for liquid expansion, the cylinder must never be filled beyond what percent of its capacity?
a.50 percent
b.60 percent
c.95 percent
d.80 percent
解析
Refrigerant recovery cylinders must never be filled beyond 80 percent of capacity by weight, leaving vapor space so the liquid can expand safely as temperature rises. Overfilling can cause the cylinder to become hydrostatically full and rupture. Filling to 95 percent is dangerous, while 50 or 60 percent is unnecessarily conservative and not the rule.
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