MACS 609 CERTIFICATION EXAM QUESTIONS AND ANSWERS
(VERIFIED ANSWERS) (LATEST UPDATE 2025) UPDATE!!
the use of ultraviolet (UV) or Approved by some vehicle manufactures but not by others
fluorescent dyes in an HFO-
1234yf system is
One effect of some refrigerant Contribute to trapping heat
gases in the atmosphere is that
they
Which item is not mentioned Sludge
in the SAE J2099 Standard
of refrigerant purity?
When it has been determined Perform a leak test procedure
that an A/C system has a low
refrigerant charge, what
should be done?
Which item is not mentioned Acid
in the SAE J1991 standard
of refrigerant purity?
Which of the following is A/C Compressor
unlikely to affect refrigerant
charge accuracy?
CFC-12 recovery equipment has Quick-couple design
SAE 3/8- inch service fittings.
HFC-134a recovery equipment
has
What is the advantage of using Allows the ability to determine what type of refrigerant is in system
refrigerant identification
equipment?
, If an HFC-134a A/C system still 2 minutes
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
Paid technicians who service Must be Section 608 Type II Certified
or repair buses using HCFC-22
as refrigerant, and/or service or
repair aircraft or ship/boat
cargo refrigeration equipment
Specific safety information for Material safety data sheet (MSDS) for the chemical
managing incidents involving
refrigerants and other
chemicals (inhalation, spills,
fires, etc.) is found in the
To what does Global Warming Relative ability to produce global warming effect
Potential (GWP) refer?
When performing engine pre- Make sure the compressor is operating
heat for
refrigerant removal, the
technician should do ALL of
the following EXCEPT
PAG lubricant Is hygroscopic (absorbs moisture)
Electronic leak detectors 0.15 ounce (4 grams) per year
certified to SAE J2791 have the
capability of identifying
leakage rates as low as
When using an HFC-134a 5 minutes
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
(VERIFIED ANSWERS) (LATEST UPDATE 2025) UPDATE!!
the use of ultraviolet (UV) or Approved by some vehicle manufactures but not by others
fluorescent dyes in an HFO-
1234yf system is
One effect of some refrigerant Contribute to trapping heat
gases in the atmosphere is that
they
Which item is not mentioned Sludge
in the SAE J2099 Standard
of refrigerant purity?
When it has been determined Perform a leak test procedure
that an A/C system has a low
refrigerant charge, what
should be done?
Which item is not mentioned Acid
in the SAE J1991 standard
of refrigerant purity?
Which of the following is A/C Compressor
unlikely to affect refrigerant
charge accuracy?
CFC-12 recovery equipment has Quick-couple design
SAE 3/8- inch service fittings.
HFC-134a recovery equipment
has
What is the advantage of using Allows the ability to determine what type of refrigerant is in system
refrigerant identification
equipment?
, If an HFC-134a A/C system still 2 minutes
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
Paid technicians who service Must be Section 608 Type II Certified
or repair buses using HCFC-22
as refrigerant, and/or service or
repair aircraft or ship/boat
cargo refrigeration equipment
Specific safety information for Material safety data sheet (MSDS) for the chemical
managing incidents involving
refrigerants and other
chemicals (inhalation, spills,
fires, etc.) is found in the
To what does Global Warming Relative ability to produce global warming effect
Potential (GWP) refer?
When performing engine pre- Make sure the compressor is operating
heat for
refrigerant removal, the
technician should do ALL of
the following EXCEPT
PAG lubricant Is hygroscopic (absorbs moisture)
Electronic leak detectors 0.15 ounce (4 grams) per year
certified to SAE J2791 have the
capability of identifying
leakage rates as low as
When using an HFC-134a 5 minutes
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
