RSES Refrigerant Management 2

Question 1

Under EPA Section 608, what is the maximum allowable annual leak rate for refrigerant in a commercial refrigeration system containing more than 50 lbs of refrigerant?

Accepted Answer

20%

Answer

EPA Section 608 sets the annual leak rate threshold at 20% for commercial refrigeration systems with more than 50 lbs of refrigerant.

Question 2

Which refrigerant blend is classified as a zeotropic mixture, meaning its components evaporate and condense at different temperatures?

Accepted Answer

R-404A

Answer

R-404A is a zeotropic blend of R-125, R-143a, and R-134a that exhibits temperature glide during phase change.

Question 3

When recovering refrigerant from a system with a compressor that is not operational, a technician must use what type of recovery method?

Accepted Answer

System-dependent recovery

Answer

System-dependent (passive) recovery relies on the system's own components and is only viable when the compressor is operable; with a non-operational compressor, a self-contained recovery unit must be used.

Question 4

What does the term 'temperature glide' refer to in refrigerant blends?

Accepted Answer

The range of temperatures at which a blend changes phase at constant pressure

Answer

Temperature glide is the difference between the bubble point and dew point temperatures of a zeotropic blend during phase change at constant pressure.

Question 5

A recovery cylinder must not be filled beyond what percentage of its rated capacity by weight?

Accepted Answer

80%

Answer

DOT regulations require that refrigerant recovery cylinders not be filled beyond 80% of their rated capacity by weight to allow for thermal expansion.

(RSES) Refrigeration Service Engineers Society Certification Practice Test

(RSES) Refrigeration Service Engineers Society Certification Practice Test

RSES Refrigerant Management 2