EPA 609 Refrigerant Types & Properties 3

Question 1

Which term describes the process where a refrigerant blend separates into its component gases during a leak?

Accepted Answer

Fractionation

Answer

Condensation

Answer

Sublimation

Answer

Vaporization

Question 2

What is the ASHRAE safety classification of R-134a?

Accepted Answer

A1 (non-toxic, non-flammable)

Answer

A2L (mildly flammable)

Answer

B1 (toxic, non-flammable)

Answer

A2 (flammable)

Question 3

At what temperature does R-134a become a gas in an MVAC system's evaporator?

Accepted Answer

Above its boiling point at the low-side operating pressure

Answer

Below 32°F regardless of pressure

Answer

At exactly 0°F

Answer

Only above 70°F ambient temperature

Question 4

Which refrigerant has the highest ozone depletion potential (ODP) among those listed?

Accepted Answer

R-12

Answer

R-134a

Answer

R-1234yf

Answer

R-404A

Question 5

What does the term 'critical point' mean for a refrigerant?

Accepted Answer

The temperature and pressure above which liquid and vapor phases are indistinguishable

Answer

The temperature at which it catches fire

Answer

The pressure at which recovery equipment fails

Answer

The minimum temperature for safe storage

Question 6

Why must refrigerant cylinders never be completely filled with liquid?

Accepted Answer

Liquid expansion from heat can cause cylinder rupture

Answer

It causes the refrigerant to decompose chemically

Answer

It prevents the recovery machine from drawing a vacuum

Answer

Regulations require a minimum vapor space for labeling