Type II — High-PressureCâu 133 / 240
A technician fills a DOT recovery cylinder with recovered R-22. To prevent a dangerous hydrostatic rupture, the cylinder must not be filled beyond what fraction of its capacity?
a.95% by weight
b.100% by weight
c.90% by volume
d.80% by weight
Giải thích
A recovery cylinder must never be filled beyond 80% of its rated capacity by weight to leave room for liquid to expand as temperature rises. Overfilling can create extreme hydrostatic pressure and burst the cylinder. A scale should be used to weigh the charge and stop at the 80% limit.
Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A technician is charging an R-410A system that uses a near-azeotropic blend. To keep the blend's composition correct, how should refrigerant be removed from the cylinder during charging?
- A technician checks the charge on an R-22 system that uses a fixed orifice (piston) metering device. Which measurement is the primary method to verify the charge?
- A technician is checking the charge on a system equipped with a thermostatic expansion valve (TXV). Which measurement is the preferred way to verify the charge on a TXV system?
- A technician needs to locate a small refrigerant leak on an R-22 condensing unit. Which method is a recognized leak-detection technique?
- A technician pressure-tests a repaired R-410A system for leaks before evacuating. Which gas is appropriate for pressurizing the system for a leak test?
- A technician notices R-410A gauge pressures running much higher than an equivalent R-22 system at the same conditions. What does this reflect about R-410A?
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