MACS 609 CERTIFICATION EXAM WITH QUESTIONS AND WELL VERIFIED ANSWERS[GRADED A+]

MACS 609 CERTIFICATION EXAM WITH QUESTIONS AND WELL VERIFIED ANSWERS[GRADED A+] If lubricant is removed by recovery equipment during system refrigerant removal, what must be done with the lubricant? - 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? - 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? - 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? - ANS---Accumulator type Electronic leak detectors certified to SAE J2791 have the capacity of identifying leakage rates as low as: - 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? - ANS---Generally, very little, if any Why is it necessary to insure that service port caps containing good seals are installed? - ANS---To minimize refrigerant loss Which of the following statements is correct about flushing A/C systems? - 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? - ANS---5 minutes Which type of tank must be used during the transfer of refrigerant? - ANS---Question 10 options: Tanks marked DOT 4BA When it has been determined that an A/C system has a low refrigerant charge, what should be done? - ANS---Perform a leak detection procedure One effect of some refrigerant gases in the atmosphere is that they: - ANS---Contribute to trapping heat How much moisture is removed from a mobile A/C system during a typical evacuation? - ANS---Possibly non