MACS 609 CERTIFICATION QUESTIONS AND ANSWERS ALREADY PASSED

MACS 609 CERTIFICATION QUESTIONS AND ANSWERS ALREADY PASSED If lubricant is removed by recovery equipment during system refrigerant removal, what must be done with the lubricant? 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? Question 2 options: Recycle the HFC-134a before reuse using certified equipment When can HFC-134a become combustible in a mobile air conditioning system? 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? Accumulator type Electronic leak detectors certified to SAE J2791 have the capacity of identifying leakage rates as low as: 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? Generally, very little, if any Why is it necessary to insure that service port caps containing good seals are installed? To minimize refrigerant loss Which of the following statements is correct about flushing A/C systems? 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? 5 minutes Which type of tank must be used during the transfer of refrigerant? 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? Perform a leak detection procedure One effect of some refrigerant gases in the atmosphere is that they: Contribute to trapping heat Mixing CFC-12 and HFC-134a in the same system will: Result in refrigerant cross contamination How much moisture is removed from a mobile A/C system during a typical evacuation? Possibly none Paid technicians who service or repair mobile A/C systems using HFC-22 as refrigerant, or service cargo refrigeration equipment: Must be Section 608 Type II certified HFO-1234yf is classified as "A2L-mildly flammable." This means: It can ignite under certain circumstances Section 609 of the Clean Air Act requires that recovery/recycling equipment: Must be registered with the EPA What is the advantage of using refrigerant identification equipment? Allows the ability to determine what type of refrigerant is in system When performing engine pre-heat for refrigerant removal, the technician should do ALL of the following EXCEPT: Make sure the compressor is operating If a large amount of lubricant is removed from a system during refrigerant recovery: The system likely contained too much lubricant PAG lubricant: Is hygroscopic (absorbs moisture) Specific safety information for managing incidents involving refrigerants and other chemicals (inhalation, spills, fires, etc) is found in the: Material safety data sheet (MSDS) for the chemical What is not identified in the manual as a concern with field-coupled hoses? Length of hose Which of the following is NOT a factor in how much refrigerant can be recovered from an A/C system? The age of the vehicle HFO-1234yf can be used in: Any light vehicle with an air conditioning system designed to use it