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MACS 609 CERTIFICATION Q&A.
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MACS 609 CERTIFICATION Q&A.
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MACS 609 CERTIFICATION✅✅
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
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
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