NCT Refrigerant Management & Environmental Compliance 2

Question 1

Under EPA Section 608, what is the maximum allowable leak rate for a commercial refrigeration system with a charge of 50 lbs or more before repair is required?

Accepted Answer

20% per year

Answer

EPA Section 608 sets the leak rate threshold for commercial refrigeration systems at 20% of charge per year, triggering a mandatory repair obligation.

Question 2

Which refrigerant blend is classified as an R-400 series and is a zeotropic mixture?

Accepted Answer

R-404A

Answer

R-404A is a zeotropic blend in the R-400 series, meaning its components evaporate at different rates and it exhibits temperature glide.

Question 3

What does 'fractionation' mean in the context of zeotropic refrigerant blends?

Accepted Answer

The separation of blend components due to differing vapor pressures

Answer

Fractionation occurs when components of a zeotropic blend separate due to different vapor pressures, changing the mixture's composition and properties.

Question 4

Which of the following is a PRIMARY reason R-410A cannot be used as a drop-in replacement for R-22?

Accepted Answer

R-410A operates at significantly higher pressures than R-22

Answer

R-410A operates at roughly 60% higher pressures than R-22, making it incompatible with components and compressors designed for R-22 systems.

Question 5

Under the AIM Act, EPA is required to phase down HFC production and consumption by what percentage by 2036?

Accepted Answer

70%

Answer

The AIM Act mandates a 70% reduction in HFC production and consumption by 2036 compared to the established baseline.

(NCT) NAFA Certified Technician Practice Test

(NCT) NAFA Certified Technician Practice Test

NCT Refrigerant Management & Environmental Compliance 2