MACS 609 CERTIFICATION.
Perfect Prep for Every Paper | Precision in Every Answer!
The use of ultraviolet (UV) or fluorescent dyes in an HFO-1234yf system is: - Answer:
Approved by some vehicle manufactures but not by others
One effect of some refrigerant gases in the atmosphere is that they: - Answer:
Contribute to trapping heat
Which item is not mentioned in the SAE J2099 Standard of refrigerant purity? - Answer:
Sludge
When it has been determined that an A/C system has a low refrigerant charge, what
should be done? - Answer: Perform a leak test procedure
Which item is not mentioned in the SAE J1991 standard of refrigerant purity? - Answer:
Acid
Which of the following is unlikely to affect refrigerant charge accuracy? - Answer: A/C
Compressor
CFC-12 recovery equipment has SAE 3/8-inch service fittings. HFC-134a recovery
equipment has: - Answer: Quick-couple design
What is the advantage of using refrigerant identification equipment? - Answer: 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: - Answer: 2 minutes
1
APPHIA - Crafted with Care and Precision for Academic Excellence.
, Paid technicians who service or repair buses using HCFC-22 as refrigerant, and/or
service or repair aircraft or ship/boat cargo refrigeration equipment: - Answer: 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: - Answer: Material safety data
sheet (MSDS) for the chemical
To what does Global Warming Potential (GWP) refer? - Answer: Relative ability to
produce global warming effect
When performing engine pre-heat for refrigerant removal, the technician should do ALL
of the following EXCEPT: - Answer: Make sure the compressor is operating
PAG lubricant: - Answer: Is hygroscopic (absorbs moisture)
Electronic leak detectors certified to SAE J2791 have the capability of identifying
leakage rates as low as: - Answer: 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? - Answer: 5 minutes
A/C system service equipment hoses must be equipped with shutoff valves located
within _______ from the "vehicle end" of the hoses. - Answer: 12 inches
To what does Ozone Depletion Potential (ODP) refer? - Answer: Relative ability to
destroy ozone
2
APPHIA - Crafted with Care and Precision for Academic Excellence.
Perfect Prep for Every Paper | Precision in Every Answer!
The use of ultraviolet (UV) or fluorescent dyes in an HFO-1234yf system is: - Answer:
Approved by some vehicle manufactures but not by others
One effect of some refrigerant gases in the atmosphere is that they: - Answer:
Contribute to trapping heat
Which item is not mentioned in the SAE J2099 Standard of refrigerant purity? - Answer:
Sludge
When it has been determined that an A/C system has a low refrigerant charge, what
should be done? - Answer: Perform a leak test procedure
Which item is not mentioned in the SAE J1991 standard of refrigerant purity? - Answer:
Acid
Which of the following is unlikely to affect refrigerant charge accuracy? - Answer: A/C
Compressor
CFC-12 recovery equipment has SAE 3/8-inch service fittings. HFC-134a recovery
equipment has: - Answer: Quick-couple design
What is the advantage of using refrigerant identification equipment? - Answer: 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: - Answer: 2 minutes
1
APPHIA - Crafted with Care and Precision for Academic Excellence.
, Paid technicians who service or repair buses using HCFC-22 as refrigerant, and/or
service or repair aircraft or ship/boat cargo refrigeration equipment: - Answer: 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: - Answer: Material safety data
sheet (MSDS) for the chemical
To what does Global Warming Potential (GWP) refer? - Answer: Relative ability to
produce global warming effect
When performing engine pre-heat for refrigerant removal, the technician should do ALL
of the following EXCEPT: - Answer: Make sure the compressor is operating
PAG lubricant: - Answer: Is hygroscopic (absorbs moisture)
Electronic leak detectors certified to SAE J2791 have the capability of identifying
leakage rates as low as: - Answer: 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? - Answer: 5 minutes
A/C system service equipment hoses must be equipped with shutoff valves located
within _______ from the "vehicle end" of the hoses. - Answer: 12 inches
To what does Ozone Depletion Potential (ODP) refer? - Answer: Relative ability to
destroy ozone
2
APPHIA - Crafted with Care and Precision for Academic Excellence.
