MACS 609 Certification Exam UPDATED
ACTUAL QUESTIONS AND CORRECT
ANSWERS
If lubricant is removed by recovery equipment during system refrigerant removal, what must
be done with the lubricant? - CORRECT ANSWER Re-install lubricant removed by
the recovery equipment
Before reuse, what must be done with HFC-134a that has been recovered from a mobile A/C
system using recovery-only equipment? - CORRECT ANSWER Question 2 options:
Recycle the HFC-134a before reuse using certified equipment
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
Which type of mobile A/C system will usually require additional time / precautions to extract
all the refrigerant? - CORRECT ANSWER Accumulator type
Electronic leak detectors certified to SAE J2791 have the capacity of identifying leakage
rates as low as: - CORRECT ANSWER 0.15 ounces per year
When recovery/recycling equipment is used to remove refrigerant from a mobile A/C system,
how much lubricant will be removed during the operation? - CORRECT
ANSWER Generally, very little, if any
Why is it necessary to insure that service port caps containing good seals are installed? -
CORRECT ANSWER To minimize refrigerant loss
Which of the following statements is correct about flushing A/C systems? - CORRECT
ANSWER Flushing solvents may remain in A/C systems, causing problems
ACTUAL QUESTIONS AND CORRECT
ANSWERS
If lubricant is removed by recovery equipment during system refrigerant removal, what must
be done with the lubricant? - CORRECT ANSWER Re-install lubricant removed by
the recovery equipment
Before reuse, what must be done with HFC-134a that has been recovered from a mobile A/C
system using recovery-only equipment? - CORRECT ANSWER Question 2 options:
Recycle the HFC-134a before reuse using certified equipment
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
Which type of mobile A/C system will usually require additional time / precautions to extract
all the refrigerant? - CORRECT ANSWER Accumulator type
Electronic leak detectors certified to SAE J2791 have the capacity of identifying leakage
rates as low as: - CORRECT ANSWER 0.15 ounces per year
When recovery/recycling equipment is used to remove refrigerant from a mobile A/C system,
how much lubricant will be removed during the operation? - CORRECT
ANSWER Generally, very little, if any
Why is it necessary to insure that service port caps containing good seals are installed? -
CORRECT ANSWER To minimize refrigerant loss
Which of the following statements is correct about flushing A/C systems? - CORRECT
ANSWER Flushing solvents may remain in A/C systems, causing problems
