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MACS 609 CERTIFICATION QUESTIONS AND ANSWERS (100% PASS)
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MACS 609 CERTIFICATION QUESTIONS AND ANSWERS (100% PASS)
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©PREP4EXAMS@2024 [REAL EXAM DUMPS] Tuesday, July 23, 2024 10:52 AMMACS 609 CERTIFICATION QUESTIONS AND ANSWERS (100% PASS)
The use of ultraviolet (UV) or fluorescent dyes in an HFO-1234yf system is: - ✔️✔️Approved by
some vehicle manufactures but not by others
One effect of some refrigerant gases in the atmosphere is that they: - ✔️✔️Contribute to trapping
heat
Which item is not mentioned in the SAE J2099 Standard of refrigerant purity? - ✔️✔️Sludge
When it has been determined that an A/C system has a low refrigerant charge, what should be
done? - ✔️✔️Perform a leak test procedure
Which item is not mentioned in the SAE J1991 standard of refrigerant purity? - ✔️✔️Acid
Which of the following is unlikely to affect refrigerant charge accuracy? - ✔️✔️A/C Compressor
CFC-12 recovery equipment has SAE 3/8-inch service fittings. HFC-134a recovery equipment
has: - ✔️✔️Quick-couple design
What is the advantage of using refrigerant identification equipment? - ✔️✔️Allows the ability to
determine what type of refrigerant is in system
If an HFC-134a A/C system still has pressure after the first refrigerant recovery process is
complete (including the five-minute pause), additional recovery is necessary until the system
vacuum level remains stable for: - ✔️✔️2 minutes
Paid technicians who service or repair buses using HCFC-22 as refrigerant, and/or service or
repair aircraft or ship/boat cargo refrigeration equipment: - ✔️✔️Must be Section 608 Type II
Certified
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
To what does Global Warming Potential (GWP) refer? - ✔️✔️Relative ability to produce global
warming effect
When performing engine pre-heat for refrigerant removal, the technician should do ALL of the
following EXCEPT: - ✔️✔️Make sure the compressor is operating
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, ©PREP4EXAMS@2024 [REAL EXAM DUMPS] Tuesday, July 23, 2024 10:52 AM
PAG lubricant: - ✔️✔️Is hygroscopic (absorbs moisture)
Electronic leak detectors certified to SAE J2791 have the capability of identifying leakage rates
as low as: - ✔️✔️Electronic leak detectors certified to SAE J2791 have the capability of
identifying leakage rates as low as:
When using an HFC-134a refrigerant recovery machine, after completing 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
A/C system service equipment hoses must be equipped with shutoff valves located within
_______ from the "vehicle end" of the hoses. - ✔️✔️12 inches
To what does Ozone Depletion Potential (ODP) refer? - ✔️✔️Relative ability to destroy ozone
Which type of tank must be used during the transfer of refrigerant? - ✔️✔️Tanks marked DOT
4BA
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
Mineral-based lubricants are used in which type of mobile A/C system? - ✔️✔️CFC-12
How much moisture is removed from a mobile A/C system during a typical evacuation? -
✔️✔️Possibly none
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
Mobile A/C system design changes, new service procedures and equipment have been developed
for what reason? - ✔️✔️To reduce lifetime refrigerant emissions
Why is it necessary to ensure that service port caps containing good seals are installed? - ✔️✔️To
minimize refrigerant loss
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
The U.S. EPA has classified HFO-1234yf as "Acceptable, subject to use conditions." That
means: - ✔️✔️The refrigerant may only be used in newly manufactured vehicles with components
specifically designed for it
HFO-1234yf has been tested and found compatible with: - ✔️✔️PAG oil
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