What leaves the metering device in an operating R-22 system?
Refrigeration · EPA 608 Type II. The correct answer, and the reasoning behind it.
Identifying refrigerants, system components and the state of refrigerant in each.
The question
What leaves the metering device in an operating R-22 system?
- High-pressure liquid
- High-pressure vapor
- Low-pressure superheated vapor, the same as the suction line
- A low-pressure mix of liquid and vaporCorrect answer
Why “A low-pressure mix of liquid and vapor” is correct
The metering device drops the pressure of the high-pressure liquid. Some of it flashes to vapor, so a cold, low-pressure mix of liquid and vapor enters the evaporator.
Source: EPA: Test Topics
Why the other answers are wrong
- High-pressure liquid — High-pressure liquid enters the metering device; it does not leave it.
- High-pressure vapor — High-pressure vapor is in the discharge line.
- Low-pressure superheated vapor, the same as the suction line — Superheated low-pressure vapor leaves the evaporator.
Practice more of this
More EPA 608 Type II practice questions, or see every EPA 608 practice test.
Unofficial, not affiliated with the EPA or any EPA-approved certifying organization. Questions are original practice written from public EPA material, not real exam questions.