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MACS 609 CERTIFICATION Exam Questions and Complete Solution
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MACS 609 CERTIFICATION Exam Questions and Complete Solution
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MACS 609 CERTIFICATION Exam Questions and Complete SolutionsIf lubricant is removed by recovery equipment during system refrigerant removal, what must be done with the lubricant? - Correct Ans: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 Ans: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 Ans: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 Ans:Accumulator type
Electronic leak detectors certified to SAE J2791 have the capacity of identifying leakage rates as low as: - Correct Ans: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 Ans:Generally, very little, if any
Why is it necessary to insure that service port caps containing good seals are installed? - Correct Ans:To minimize refrigerant loss
Which of the following statements is correct about flushing A/C systems? - Correct Ans:Flushing solvents may remain in A/C systems, causing problems
When using an HFC-134a refrigerant recovery machine, after competing the first recovery process, how long must you wait, then check the machine's gauges for a rise in pressure above vacuum, which would indicate that the system still contains some refrigerant? - Correct Ans:5 minutes
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