MACS 609 CERTIFICATION EXAM | QUESTIONS & ANSWERS (VERIFIED) | LATEST UPDATE | GRADED A+

MACS 609 CERTIFICATION EXAM | QUESTIONS & ANSWERS (VERIFIED) | LATEST UPDATE | GRADED A+ 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 2 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 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 Answer: 5 minutes Which type of tank must be used during the transfer of refrigerant? Correct Answer: Question 10 options: Tanks marked DOT 4BA 3 When it has been determined that an A/C system has a low refrigerant charge, what should be done? Correct Answer: Perform a leak detection procedure One effect of some refrigerant gases in the atmosphere is that they: Correct Answer: Contribute to trapping heat Mixing CFC-12 and HFC-134a in the same system will: Correct Answer: Result in refrigerant cross contamination How much moisture is removed from a mobile A/C system during a typical evacuation? Correct Answer: Possibly none Paid technicians who service or repair mobile A/C systems using HFC-22 as refrigerant, or service cargo refrigeration equipment: Correct Answer: Must be Section 608 Type II certified HFO-1234yf is classified as "A2L-mildly flammable." This means: Correct Answer: It can ignite under certain circumstances Section 609 of the Clean Air Act requires that recovery/recycling equipment: Correct Answer: Must be registered with the EP