CFC Refrigerant Identification & Testing 3

Question 1

What does the term 'temperature glide' mean when referring to zeotropic refrigerant blends?

Accepted Answer

The difference in temperature between the start and end of evaporation or condensation at constant pressure

Answer

The temperature at which the refrigerant begins to freeze

Answer

The superheat measurement above saturation temperature

Answer

The rate of temperature change during compression

Question 2

Which refrigerant has the highest Ozone Depletion Potential (ODP) among the following options?

Accepted Answer

R-11

Answer

R-134a

Answer

R-410A

Answer

R-22

Question 3

What is the significance of a refrigerant's Global Warming Potential (GWP) value?

Accepted Answer

It compares the refrigerant's heat-trapping ability to CO2 over a 100-year period

Answer

It measures the refrigerant's flammability and explosion risk

Answer

It indicates the refrigerant's acute toxicity classification

Answer

It measures the refrigerant's coefficient of performance

Question 4

What is the correct method for sampling vapor-phase refrigerant from a cylinder when using a refrigerant identifier?

Accepted Answer

Sample from the vapor phase after allowing the cylinder to stabilize at room temperature

Answer

Sample only from the liquid phase at the bottom of the upright cylinder

Answer

Mix liquid and vapor phases before sampling for accuracy

Answer

Sample immediately after moving the cylinder to get a fresh reading

Question 5

How does a technician confirm that a system has been adequately evacuated of refrigerant before opening it for component replacement?

Accepted Answer

Measure system pressure with manifold gauges — readings should be at or below atmospheric (0 psig or in vacuum)

Answer

Verify the sight glass is completely clear of bubbles

Answer

Wait a standard 24-hour hold period after recovery is complete

Answer

Confirm the compressor is cool to the touch before opening

Question 6

What contaminant is most likely present when recovered refrigerant from a system has a sharp, pungent, acrid odor?

Accepted Answer

Acid and decomposition products from a compressor motor burnout

Answer

Moisture contamination from air infiltration

Answer

Non-condensable gases such as nitrogen

Answer

Mineral oil carried over from the compressor

Question 7

Which regulatory framework governs the labeling, marking, and transportation requirements for refrigerant cylinders shipped in the United States?

Accepted Answer

DOT Hazardous Materials Regulations under 49 CFR

Answer

EPA Section 608 regulations under 40 CFR

Answer

ASHRAE Standard 34 safety classifications

Answer

AHRI Standard 700 purity specifications