Question

1. What is the advantage of using refrigerant identification equipment?
A. Determines if system is correctly charged
B. Has no advantage
C. Should be used when performing "Top Of service
D. Allows the ability to determine what type of refrigerant is in system

2. Mineral-based lubricants are used in which type of mobile A/C system?
A. CFC-12
B. HFC-134a
C. accumulator systems
D. All receiver/drier systems

3. PAG lubricant:
A. Is for A/C systems that use CFC-12
B. Is hygroscopic (absorbs moisture)
C. Is always red in color
D. Must be regularly purged from A/C service equipment hoses

4. Which item is not mentioned in the SAE J2099 standard of refrigerant purity?
A. Moisture
B. Sludge
C. Refrigerant oil
D. Air (non-condensable gas)

5. HFO-1234yf has been tested and found compatible with:
A. PAG oil
B. Mineral oil
C. Hydraulic oil
D. All of the items in A, B, and C

Answer 1

Q1) D. Allows the ability to determine what type of refrigerant is in the system.

Reason- This explanation is based on mobile A/Cs. The identifier helps in identifying contaminated refeigerants as it is harmful for service equipment and can damage other units also. Mixing of refrigerants can result in elevated working pressure that can reduce the A/C performance and can possibly damage other system components.

Q2) A. CFC-12

Q3) D. Must be purged from A/C service equipment hoses

because purging the lubricants helps in removing yhe contamination from the system.

Q4) A. Moisture

Q5) D. All of the items in A, B and C

The answers are best of my knowledge and took help of internet for some. Hope, I got all questions correct.