MACS 609 CERTIFICATION EXAM
QUESTIONS AND CORRECT ANSWERS
Question 1
Which of the following statements is correct about flushing A/C systems?
Correct Answer
Flushing solvents may remain in A/C systems, causing problems
Question 2
To what does Global Warming Potential (GWP) refer?
Correct Answer
Relative ability to produce global warming effect
Question 3
HFO-1234yf is classified as "A2L-mildly flammable." This means:
Correct Answer
It can ignite under certain circumstances
Question 4
Which of the following are concerns regarding purity of HFC-134a?
Correct Answer
All of the answers are true
Question 5
Is it acceptable and legal to vent HFC-134a?
Correct Answer
No
Page 1 of 18
,Question 6
Why must recycled refrigerant be checked for air?
Correct Answer
To avoid performance loss, system damage
Question 7
Mobile A/C system design changes, new service procedures and equipment have
been developed for what reason?
Correct Answer
To reduce lifetime refrigerant emissions
Question 8
Which of the following is unlikely to affect refrigerant charge accuracy?
Correct Answer
A/C Compressor
Question 9
When can HFC-134a become combustible in a mobile air conditioning system?
Correct Answer
If shop air is used in the system in an attempt to check for leaks and HFC-134a is
present
Question 10
Which of the following air conditioning system component(s) must be approved or
certified to SAE J2842 for use in an HFO-1234yf system?
Correct Answer
Evaporators
Page 2 of 18
, Question 11
How much moisture is removed from a mobile A/C system during a typical
evacuation?
Correct Answer
Possibly none
Question 12
Which of the following is the best way to charge an A/C system?
Correct Answer
Remove charge, evacuate system, add correct amount of refrigerant
Question 13
What transports ultraviolet dye through the A/C system?
Correct Answer
Refrigerant oil
Question 14
CFC-12 recovery equipment has SAE 3/8-inch service fittings. HFC-134a recovery
equipment has:
Correct Answer
Quick-couple design
Question 15
One effect of some refrigerant gases in the atmosphere is that they:
Correct Answer
Contribute to trapping heat
Page 3 of 18
QUESTIONS AND CORRECT ANSWERS
Question 1
Which of the following statements is correct about flushing A/C systems?
Correct Answer
Flushing solvents may remain in A/C systems, causing problems
Question 2
To what does Global Warming Potential (GWP) refer?
Correct Answer
Relative ability to produce global warming effect
Question 3
HFO-1234yf is classified as "A2L-mildly flammable." This means:
Correct Answer
It can ignite under certain circumstances
Question 4
Which of the following are concerns regarding purity of HFC-134a?
Correct Answer
All of the answers are true
Question 5
Is it acceptable and legal to vent HFC-134a?
Correct Answer
No
Page 1 of 18
,Question 6
Why must recycled refrigerant be checked for air?
Correct Answer
To avoid performance loss, system damage
Question 7
Mobile A/C system design changes, new service procedures and equipment have
been developed for what reason?
Correct Answer
To reduce lifetime refrigerant emissions
Question 8
Which of the following is unlikely to affect refrigerant charge accuracy?
Correct Answer
A/C Compressor
Question 9
When can HFC-134a become combustible in a mobile air conditioning system?
Correct Answer
If shop air is used in the system in an attempt to check for leaks and HFC-134a is
present
Question 10
Which of the following air conditioning system component(s) must be approved or
certified to SAE J2842 for use in an HFO-1234yf system?
Correct Answer
Evaporators
Page 2 of 18
, Question 11
How much moisture is removed from a mobile A/C system during a typical
evacuation?
Correct Answer
Possibly none
Question 12
Which of the following is the best way to charge an A/C system?
Correct Answer
Remove charge, evacuate system, add correct amount of refrigerant
Question 13
What transports ultraviolet dye through the A/C system?
Correct Answer
Refrigerant oil
Question 14
CFC-12 recovery equipment has SAE 3/8-inch service fittings. HFC-134a recovery
equipment has:
Correct Answer
Quick-couple design
Question 15
One effect of some refrigerant gases in the atmosphere is that they:
Correct Answer
Contribute to trapping heat
Page 3 of 18
