ASE Refrigerant Recovery, Recycling, and Handling

Question 1

Which refrigerant has largely replaced R-134a in newer vehicle A/C systems due to its lower global warming potential?

Accepted Answer

R-1234yf

Answer

R-22

Answer

R-410A

Answer

R-12

Question 2

What federal regulation requires technicians to be certified before purchasing or handling refrigerants used in motor vehicle air conditioning?

Accepted Answer

EPA Section 609

Answer

EPA Section 608

Answer

SAE J639

Answer

CAA Title IV

Question 3

Before opening a vehicle A/C system for service, the technician MUST first:

Accepted Answer

Recover all refrigerant using approved equipment

Answer

Add UV dye to identify leaks

Answer

Flush the system with nitrogen

Answer

Measure the system superheat

Question 4

A refrigerant identifier displays contamination in a sample recovered from a vehicle. The technician should:

Accepted Answer

Store it in a dedicated contaminated refrigerant cylinder and send it to a reclaimer

Answer

Recharge the system and note the contamination

Answer

Mix it with clean refrigerant to dilute the contaminant

Answer

Vent it outdoors since it is already contaminated

Question 5

What color is used to identify the HIGH-SIDE hose on a standard A/C manifold gauge set?

Accepted Answer

Red

Answer

Blue

Answer

Yellow

Answer

Green

Question 6

What is the purpose of evacuating an A/C system with a vacuum pump before recharging?

Accepted Answer

To remove moisture and non-condensable gases

Answer

To increase system pressure for leak testing

Answer

To circulate compressor oil through the system

Answer

To cool the condenser before refrigerant is added

Question 7

Which type of oil is required for use in R-1234yf A/C systems?

Accepted Answer

PAG (Polyalkylene Glycol) oil

Answer

Mineral oil

Answer

POE (Polyolester) oil

Answer

Alkylbenzene oil