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MACS 609 CERTIFICATION EXAM/60 QUESTIONS AND ANSWERS
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MACS 609 CERTIFICATION EXAM/60 QUESTIONS AND ANSWERS
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MACS 609 CERTIFICATION EXAM/60 QUESTIONSAND ANSWERS
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
-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
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